This app is specifically for protecting your chat messages.

To lock the screen when you use any chat apps by using password pattern

Includes:

WhatsApp, BBM, Skype, Snapchat, Instagram, Telegram, Viber, LINE, WeChat, Google Hangouts, Facebook & Facebook Message, SMS, Twitter,Pinterest, Vine, Ask.fm, Tango, KakaoTalk, BeeTalk and Yahoo Messenger etc ...

This app can keep your privacy and secure

Just use on / off to choose which app you want to lock and you can also configure lock setting by yourself.

have a fun ^^ this is Messenger lock