Yow, I just got successfully phished on the Facebook Android app. I clicked on "Your friend X tagged in a post" and this thing managed to put a browser window over the top of the FB app so it looked like I was still in the app, totally consistent style, and asked for a Facebook login, which I haven't done for years so I thought made sense. I fell for it, and I bet most people wouldn't have noticed it was sketchy, which I fortunately did; password hastily changed….
@timbray thanks for sharing!
If you switch to using a password manager, then it won’t insert your password into the UI, prompting you to notice that and start questioning what’s up.
If you haven’t already, you could enable MFA, such as a TOTP, to try to limit the effectiveness of stealing the password (though they can be phished along with the password).
Did you check the logged in sessions to make sure the culprit isn’t still logged in after the password change?