Logout Facebook Messenger
Well, it's not possible to sign out from within the Messenger but there is a simple workaround to do so if you're utilizing an Android gadget. iPhone, iPad and WP users can likewise logout without uninstalling the app however that needs utilizing Facebook's web user interface, either from your mobile browser or desktop. Though, this isn't an easy to use method however will do the required task.
Logout from Messenger on Android
Go to phone Settings > Applications and open the Messenger app. Click the 'Clear information' choice and now open Messenger. You'll now able to log into Messenger using a various Facebook account. Note: If you've Facebook app installed and you're singed into it then Messenger will still reveal your formerly linked account that can be set up right away.
To check in using a various ID, just click the 'Switch Account' option. In case you wish to unlink your earlier account from Messenger, simply logout from Facebook app.
Note: Clearing data will get rid of the app settings and all your messenger information (stored locally) such as photos. However, the messages and photos will be synced once again with your account. Follow the below alternate treatment rather, if you don't desire the data to be wiped off.
Logout from Facebook App/ Messenger App on iOS, Android, Windows Phone and Desktop (Recommended Technique).
This is a really helpful way to from another location logout from Facebook from any or all of the gadgets to which your Facebook account is linked with. It comes real helpful in case you loose access to a particular device and wish to prevent unauthorised access to your account. The advantage of this workaround is that it does not clean your regional Messenger data and works with all major mobile OS like iOS (iPhone, iPad, iPod touch), Android and Windows Phone.
To do so, log into your Facebook account from your desktop browser or usage Chrome browser to log into facebook.com on your smart device and select desktop version of the site. In Facebook, browse to Settings > Security and click on "Where You're Visited" option.
Here you can see all your Facebook active sessions along with details like Device type. Select the Messenger one and click "End activity". Now open Messenger on your phone and it'll automatically log off (wait on an instant and make sure you're linked to Internet.).
Dear Facebook, please do not irritate users by pulling off basic functionality. Take that! And one more thing please don’t forget to share this awesome trick to use the Logout Facebook Messenger with your friends.