How To Turn Off Messenger On Facebook
Well, it's not possible to sign out from within the Messenger but there is a simple workaround to do so if you're using an Android gadget. iPhone, iPad and WP users can likewise logout without uninstalling the app however that needs utilizing Facebook's web interface, either from your mobile web browser or desktop. Though, this isn't an easy to use way but will do the required job.
Logout from Messenger on Android
Go to phone Settings > Applications and open the Messenger app. Click the 'Clear data' alternative and now open Messenger. You'll now able to log into Messenger using a different Facebook account. Note: If you've Facebook app set up and you're singed into it then Messenger will still show your formerly linked account that can be configured right away.
To sign in using a different ID, simply click on the 'Switch Account' option. In case you desire to unlink your earlier account from Messenger, simply logout from Facebook app.
Keep in mind: Clearing data will eliminate the app settings and all your messenger data (kept locally) such as photos. However, the messages and images will be synced again with your account. Follow the below alternate treatment rather, if you don't desire the data to be cleaned off.
Logout from Facebook App/ Messenger App on iOS, Android, Windows Phone and Desktop (Recommended Approach).
This is a really helpful method to remotely logout from Facebook from any or all the gadgets to which your Facebook account is connected with. It comes real useful in case you loose access to a specific device and desire to prevent unauthorised access to your account. The advantage of this workaround is that it doesn't wipes your regional Messenger information and works with all significant mobile OS like iOS (iPhone, iPad, iPod touch), Android and Windows Phone.
To do so, log into your Facebook account from your desktop internet browser or usage Chrome internet browser to log into facebook.com on your mobile phone and go with desktop version of the website. In Facebook, navigate to Settings > Security and click "Where You're Visited" option.
Here you can see all your Facebook active sessions in addition to information like Gadget type. Select the Messenger one and click on "End activity". Now open Messenger on your phone and it'll immediately log off (wait on a short while and make certain you're linked to Web.).
Dear Facebook, please don't annoy users by pulling off standard functionality. Take that! And one more thing please don’t forget to share this awesome trick to use the How To Turn Off Messenger On Facebook with your friends.