how do i switch my old facebook with my new one, my phone keeps putting my old one back on

[AC Question]

i pull up my facebook on my phone and it's my new one then when i check it later on it switches back to my old one, now I can't switch it back-how do I fix that?

 

[B. Diddy]

Welcome to Android Central! Which phone? You're talking about the Facebook app, not the mobile website, right? Is your Facebook app fully up to date in Google Play Store?