diff --git a/Telegram/SourceFiles/auth_session.h b/Telegram/SourceFiles/auth_session.h
index 120032c59..5d74ce7b9 100644
--- a/Telegram/SourceFiles/auth_session.h
+++ b/Telegram/SourceFiles/auth_session.h
@@ -75,10 +75,18 @@ public:
 			return _moreChatsLoaded;
 		}
 
+		bool lastSeenWarningSeen() const {
+			return _lastSeenWarningSeen;
+		}
+		void setLastSeenWarningSeen(bool lastSeenWarningSeen) {
+			_lastSeenWarningSeen = lastSeenWarningSeen;
+		}
+
 	private:
 		base::Variable<bool> _contactsLoaded = { false } ;
 		base::Variable<bool> _allChatsLoaded = { false };
 		base::Observable<void> _moreChatsLoaded;
+		bool _lastSeenWarningSeen = false;
 
 	};
 	Data &data() {
diff --git a/Telegram/SourceFiles/boxes/boxes.style b/Telegram/SourceFiles/boxes/boxes.style
index bd6cff7fc..e752fb034 100644
--- a/Telegram/SourceFiles/boxes/boxes.style
+++ b/Telegram/SourceFiles/boxes/boxes.style
@@ -585,13 +585,13 @@ colorValueInput: InputField(defaultInputField) {
 colorResultInput: InputField(colorValueInput) {
 }
 
-editPrivacyOptionMargin: margins(23px, 0px, 21px, 10px);
+editPrivacyOptionMargin: margins(23px, 8px, 21px, -3px);
 editPrivacyPadding: margins(23px, 0px, 21px, 0px);
 editPrivacyTitle: FlatLabel(defaultFlatLabel) {
 	width: 320px;
 	textFg: boxTitleFg;
 	maxHeight: 46px;
-	margin: margins(0px, 13px, 0px, 10px);
+	margin: margins(0px, 13px, 0px, 7px);
 	style: TextStyle(defaultTextStyle) {
 		font: boxTitleFont;
 		linkFont: boxTitleFont;
@@ -603,4 +603,4 @@ editPrivacyLabel: FlatLabel(defaultFlatLabel) {
 	textFg: membersAboutLimitFg;
 	style: defaultTextStyle;
 }
-editPrivacyLinkMargin: margins(0px, 0px, 0px, 10px);
+editPrivacyLinkMargin: margins(0px, 0px, 0px, 8px);
diff --git a/Telegram/SourceFiles/boxes/confirmbox.cpp b/Telegram/SourceFiles/boxes/confirmbox.cpp
index 4c75bae89..c602e338a 100644
--- a/Telegram/SourceFiles/boxes/confirmbox.cpp
+++ b/Telegram/SourceFiles/boxes/confirmbox.cpp
@@ -41,7 +41,7 @@ TextParseOptions _confirmBoxTextOptions = {
 	Qt::LayoutDirectionAuto, // dir
 };
 
-ConfirmBox::ConfirmBox(QWidget*, const QString &text, base::lambda<void()> confirmedCallback, base::lambda<void()> cancelledCallback)
+ConfirmBox::ConfirmBox(QWidget*, const QString &text, base::lambda_once<void()> confirmedCallback, base::lambda_once<void()> cancelledCallback)
 : _confirmText(lang(lng_box_ok))
 , _cancelText(lang(lng_cancel))
 , _confirmStyle(st::defaultBoxButton)
@@ -51,7 +51,7 @@ ConfirmBox::ConfirmBox(QWidget*, const QString &text, base::lambda<void()> confi
 	init(text);
 }
 
-ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText, base::lambda<void()> confirmedCallback, base::lambda<void()> cancelledCallback)
+ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText, base::lambda_once<void()> confirmedCallback, base::lambda_once<void()> cancelledCallback)
 : _confirmText(confirmText)
 , _cancelText(lang(lng_cancel))
 , _confirmStyle(st::defaultBoxButton)
@@ -61,7 +61,7 @@ ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText
 	init(text);
 }
 
-ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const style::RoundButton &confirmStyle, base::lambda<void()> confirmedCallback, base::lambda<void()> cancelledCallback)
+ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const style::RoundButton &confirmStyle, base::lambda_once<void()> confirmedCallback, base::lambda_once<void()> cancelledCallback)
 : _confirmText(confirmText)
 , _cancelText(lang(lng_cancel))
 , _confirmStyle(confirmStyle)
@@ -71,7 +71,7 @@ ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText
 	init(text);
 }
 
-ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const QString &cancelText, base::lambda<void()> confirmedCallback, base::lambda<void()> cancelledCallback)
+ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const QString &cancelText, base::lambda_once<void()> confirmedCallback, base::lambda_once<void()> cancelledCallback)
 : _confirmText(confirmText)
 , _cancelText(cancelText)
 , _confirmStyle(st::defaultBoxButton)
@@ -81,7 +81,7 @@ ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText
 	init(text);
 }
 
-ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const style::RoundButton &confirmStyle, const QString &cancelText, base::lambda<void()> confirmedCallback, base::lambda<void()> cancelledCallback)
+ConfirmBox::ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const style::RoundButton &confirmStyle, const QString &cancelText, base::lambda_once<void()> confirmedCallback, base::lambda_once<void()> cancelledCallback)
 : _confirmText(confirmText)
 , _cancelText(cancelText)
 , _confirmStyle(st::defaultBoxButton)
@@ -101,12 +101,11 @@ ConfirmBox::ConfirmBox(const InformBoxTag &, const QString &text, const QString
 	init(text);
 }
 
-base::lambda<void()> ConfirmBox::generateInformCallback(base::lambda<void()> closedCallback) {
-	auto callback = closedCallback;
-	return base::lambda_guarded(this, [this, callback] {
+base::lambda_once<void()> ConfirmBox::generateInformCallback(base::lambda<void()> closedCallback) {
+	return base::lambda_guarded(this, [this, closedCallback] {
 		closeBox();
-		if (callback) {
-			callback();
+		if (closedCallback) {
+			closedCallback();
 		}
 	});
 }
diff --git a/Telegram/SourceFiles/boxes/confirmbox.h b/Telegram/SourceFiles/boxes/confirmbox.h
index f0214b8a3..f5658930c 100644
--- a/Telegram/SourceFiles/boxes/confirmbox.h
+++ b/Telegram/SourceFiles/boxes/confirmbox.h
@@ -30,11 +30,11 @@ class FlatLabel;
 class InformBox;
 class ConfirmBox : public BoxContent, public ClickHandlerHost {
 public:
-	ConfirmBox(QWidget*, const QString &text, base::lambda<void()> confirmedCallback = base::lambda<void()>(), base::lambda<void()> cancelledCallback = base::lambda<void()>());
-	ConfirmBox(QWidget*, const QString &text, const QString &confirmText, base::lambda<void()> confirmedCallback = base::lambda<void()>(), base::lambda<void()> cancelledCallback = base::lambda<void()>());
-	ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const style::RoundButton &confirmStyle, base::lambda<void()> confirmedCallback = base::lambda<void()>(), base::lambda<void()> cancelledCallback = base::lambda<void()>());
-	ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const QString &cancelText, base::lambda<void()> confirmedCallback = base::lambda<void()>(), base::lambda<void()> cancelledCallback = base::lambda<void()>());
-	ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const style::RoundButton &confirmStyle, const QString &cancelText, base::lambda<void()> confirmedCallback = base::lambda<void()>(), base::lambda<void()> cancelledCallback = base::lambda<void()>());
+	ConfirmBox(QWidget*, const QString &text, base::lambda_once<void()> confirmedCallback = base::lambda_once<void()>(), base::lambda_once<void()> cancelledCallback = base::lambda_once<void()>());
+	ConfirmBox(QWidget*, const QString &text, const QString &confirmText, base::lambda_once<void()> confirmedCallback = base::lambda_once<void()>(), base::lambda_once<void()> cancelledCallback = base::lambda_once<void()>());
+	ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const style::RoundButton &confirmStyle, base::lambda_once<void()> confirmedCallback = base::lambda_once<void()>(), base::lambda_once<void()> cancelledCallback = base::lambda_once<void()>());
+	ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const QString &cancelText, base::lambda_once<void()> confirmedCallback = base::lambda_once<void()>(), base::lambda_once<void()> cancelledCallback = base::lambda_once<void()>());
+	ConfirmBox(QWidget*, const QString &text, const QString &confirmText, const style::RoundButton &confirmStyle, const QString &cancelText, base::lambda_once<void()> confirmedCallback = base::lambda_once<void()>(), base::lambda_once<void()> cancelledCallback = base::lambda_once<void()>());
 
 	void updateLink();
 
@@ -63,7 +63,7 @@ private:
 	struct InformBoxTag {
 	};
 	ConfirmBox(const InformBoxTag &, const QString &text, const QString &doneText, base::lambda<void()> closedCallback);
-	base::lambda<void()> generateInformCallback(base::lambda<void()> closedCallback);
+	base::lambda_once<void()> generateInformCallback(base::lambda<void()> closedCallback);
 	friend class InformBox;
 
 	void confirmed();
@@ -86,8 +86,8 @@ private:
 	bool _confirmed = false;
 	bool _cancelled = false;
 	bool _strictCancel = false;
-	base::lambda<void()> _confirmedCallback;
-	base::lambda<void()> _cancelledCallback;
+	base::lambda_once<void()> _confirmedCallback;
+	base::lambda_once<void()> _cancelledCallback;
 
 };
 
diff --git a/Telegram/SourceFiles/boxes/edit_privacy_box.cpp b/Telegram/SourceFiles/boxes/edit_privacy_box.cpp
index 2afdfc41f..4459d7e12 100644
--- a/Telegram/SourceFiles/boxes/edit_privacy_box.cpp
+++ b/Telegram/SourceFiles/boxes/edit_privacy_box.cpp
@@ -99,6 +99,10 @@ public:
 		return _option->checked();
 	}
 
+	QMargins getMargins() const override {
+		return _option->getMargins();
+	}
+
 protected:
 	int resizeGetHeight(int newWidth) override;
 
@@ -117,8 +121,8 @@ int EditPrivacyBox::OptionWidget::resizeGetHeight(int newWidth) {
 	_option->resizeToNaturalWidth(newWidth);
 	auto optionTextLeft = st::defaultBoxCheckbox.textPosition.x();
 	_description->resizeToWidth(newWidth - optionTextLeft);
-	_option->moveToLeft(0, 0);
-	_description->moveToLeft(optionTextLeft, _option->bottomNoMargins());
+	_option->moveToLeft(getMargins().left(), getMargins().top());
+	_description->moveToLeft(optionTextLeft + getMargins().left(), _option->bottomNoMargins());
 	return _description->bottomNoMargins();
 }
 
@@ -332,8 +336,11 @@ void EditPrivacyBox::createWidgets() {
 
 	clearButtons();
 	addButton(lang(lng_settings_save), [this] {
-		App::api()->savePrivacy(_controller->key(), collectResult());
-		closeBox();
+		auto someAreDisallowed = (_option != Option::Everyone) || !_neverUsers.empty();
+		_controller->confirmSave(someAreDisallowed, base::lambda_guarded(this, [this] {
+			App::api()->savePrivacy(_controller->key(), collectResult());
+			closeBox();
+		}));
 	});
 	addButton(lang(lng_cancel), [this] { closeBox(); });
 
diff --git a/Telegram/SourceFiles/boxes/edit_privacy_box.h b/Telegram/SourceFiles/boxes/edit_privacy_box.h
index 550231796..bd6c774f4 100644
--- a/Telegram/SourceFiles/boxes/edit_privacy_box.h
+++ b/Telegram/SourceFiles/boxes/edit_privacy_box.h
@@ -54,6 +54,10 @@ public:
 		virtual QString exceptionBoxTitle(Exception exception) = 0;
 		virtual QString exceptionsDescription() = 0;
 
+		virtual void confirmSave(bool someAreDisallowed, base::lambda_once<void()> saveCallback) {
+			saveCallback();
+		}
+
 		virtual ~Controller() = default;
 
 	protected:
diff --git a/Telegram/SourceFiles/settings/settings_privacy_controllers.cpp b/Telegram/SourceFiles/settings/settings_privacy_controllers.cpp
index f42109cd8..9fae9f5ba 100644
--- a/Telegram/SourceFiles/settings/settings_privacy_controllers.cpp
+++ b/Telegram/SourceFiles/settings/settings_privacy_controllers.cpp
@@ -24,6 +24,9 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "apiwrap.h"
 #include "observer_peer.h"
 #include "mainwidget.h"
+#include "auth_session.h"
+#include "storage/localstorage.h"
+#include "boxes/confirmbox.h"
 
 namespace Settings {
 namespace {
@@ -260,6 +263,24 @@ QString LastSeenPrivacyController::exceptionsDescription() {
 	return lang(lng_edit_privacy_lastseen_exceptions);
 }
 
+void LastSeenPrivacyController::confirmSave(bool someAreDisallowed, base::lambda_once<void()> saveCallback) {
+	if (someAreDisallowed && !AuthSession::Current().data().lastSeenWarningSeen()) {
+		auto weakBox = std::make_shared<QPointer<ConfirmBox>>();
+		auto callback = [weakBox, saveCallback = std::move(saveCallback)]() mutable {
+			if (auto box = *weakBox) {
+				box->closeBox();
+			}
+			saveCallback();
+			AuthSession::Current().data().setLastSeenWarningSeen(true);
+			Local::writeUserSettings();
+		};
+		auto box = Box<ConfirmBox>(lang(lng_edit_privacy_lastseen_description), lang(lng_continue), lang(lng_cancel), std::move(callback));
+		*weakBox = Ui::show(std::move(box), KeepOtherLayers);
+	} else {
+		saveCallback();
+	}
+}
+
 MTPInputPrivacyKey GroupsInvitePrivacyController::key() {
 	return MTP_inputPrivacyKeyChatInvite();
 }
diff --git a/Telegram/SourceFiles/settings/settings_privacy_controllers.h b/Telegram/SourceFiles/settings/settings_privacy_controllers.h
index 7c02867f3..efb47cdb3 100644
--- a/Telegram/SourceFiles/settings/settings_privacy_controllers.h
+++ b/Telegram/SourceFiles/settings/settings_privacy_controllers.h
@@ -61,6 +61,8 @@ public:
 	QString exceptionBoxTitle(Exception exception) override;
 	QString exceptionsDescription() override;
 
+	void confirmSave(bool someAreDisallowed, base::lambda_once<void()> saveCallback) override;
+
 };
 
 class GroupsInvitePrivacyController : public EditPrivacyBox::Controller, private base::Subscriber {
diff --git a/Telegram/SourceFiles/storage/localstorage.cpp b/Telegram/SourceFiles/storage/localstorage.cpp
index 75e2bcf7c..04f0650ec 100644
--- a/Telegram/SourceFiles/storage/localstorage.cpp
+++ b/Telegram/SourceFiles/storage/localstorage.cpp
@@ -48,6 +48,8 @@ using FileKey = quint64;
 constexpr char tdfMagic[] = { 'T', 'D', 'F', '$' };
 constexpr int tdfMagicLen = sizeof(tdfMagic);
 
+bool _cacheLastSeenWarningSeen = false;
+
 QString toFilePart(FileKey val) {
 	QString result;
 	result.reserve(0x10);
@@ -572,6 +574,7 @@ enum {
 	dbiUseExternalVideoPlayer = 0x49,
 	dbiDcOptions = 0x4a,
 	dbiMtpAuthorization = 0x4b,
+	dbiLastSeenWarningSeen = 0x4c,
 
 	dbiEncryptedWithSalt = 333,
 	dbiEncrypted = 444,
@@ -917,6 +920,7 @@ bool _readSetting(quint32 blockId, QDataStream &stream, int version, ReadSetting
 		Messenger::Instance().setMtpMainDcId(dcId);
 		if (userId) {
 			Messenger::Instance().authSessionCreate(UserId(userId));
+			AuthSession::Current().data().setLastSeenWarningSeen(_cacheLastSeenWarningSeen);
 		}
 	} break;
 
@@ -936,6 +940,9 @@ bool _readSetting(quint32 blockId, QDataStream &stream, int version, ReadSetting
 		if (!_checkStreamStatus(stream)) return false;
 
 		Messenger::Instance().setMtpAuthorization(serialized);
+		if (AuthSession::Exists()) {
+			AuthSession::Current().data().setLastSeenWarningSeen(_cacheLastSeenWarningSeen);
+		}
 	} break;
 
 	case dbiAutoStart: {
@@ -1083,6 +1090,18 @@ bool _readSetting(quint32 blockId, QDataStream &stream, int version, ReadSetting
 		Global::SetDialogsWidthRatio(v / 1000000.);
 	} break;
 
+	case dbiLastSeenWarningSeen: {
+		qint32 v;
+		stream >> v;
+		if (!_checkStreamStatus(stream)) return false;
+
+		if (AuthSession::Exists()) {
+			AuthSession::Current().data().setLastSeenWarningSeen(v == 1);
+		} else {
+			_cacheLastSeenWarningSeen = (v == 1);
+		}
+	} break;
+
 	case dbiWorkMode: {
 		qint32 v;
 		stream >> v;
@@ -1728,6 +1747,8 @@ void _writeUserSettings() {
 	data.stream << quint32(dbiModerateMode) << qint32(Global::ModerateModeEnabled() ? 1 : 0);
 	data.stream << quint32(dbiAutoPlay) << qint32(cAutoPlayGif() ? 1 : 0);
 	data.stream << quint32(dbiDialogsWidthRatio) << qint32(snap(qRound(Global::DialogsWidthRatio() * 1000000), 0, 1000000));
+	auto lastSeenWarningSeen = (AuthSession::Exists() ? AuthSession::Current().data().lastSeenWarningSeen() : _cacheLastSeenWarningSeen);
+	data.stream << quint32(dbiLastSeenWarningSeen) << qint32(lastSeenWarningSeen ? 1 : 0);
 	data.stream << quint32(dbiUseExternalVideoPlayer) << qint32(cUseExternalVideoPlayer());
 
 	{
@@ -2329,6 +2350,7 @@ void reset() {
 	_savedGifsKey = 0;
 	_backgroundKey = _userSettingsKey = _recentHashtagsAndBotsKey = _savedPeersKey = 0;
 	_oldMapVersion = _oldSettingsVersion = 0;
+	_cacheLastSeenWarningSeen = false;
 	_mapChanged = true;
 	_writeMap(WriteMapNow);