How to have a different password for Facebook and Facebook messenger? I have an Android phone. 

I want to use Facebook messenger as IM. 

But I don't trust my Android phone enough to give it my Facebook password. 

Q: Is there any option to set a different password for Facebook Messenger?
Yes.  I have the messenger app on my phone.  When I log in, I use my phone number and a password.  When I log into Facebook I use my email and a different password.