Out of respect and politeness, I will follow back all verified blue V accounts that follow me (except those that are Sinophobic or pornographic). However, I've been living on UTC time, so I mostly return follows in the afternoon or later. It's impossible for me not to follow back or unfollow, because I don't even know how to check if someone is trick-following me. It's just a follow, no need to put so much thought into it...