Board Thread:General Discussion/@comment-35466673-20180608034145/@comment-35284508-20180608040253

You spot them if you see that they are not advancing, gifting or responding to a gift. Or wait until MT marks them. As far as what to do... well that's up to you. I keep a few around to make sure I always have over 100 people to visit and knowing their names let's me detect the times when MT does odd things with the friends. But try not to send them gifts because it will be a waste. Of course people can sometimes recover from zombiehood and start playing again but it is rare and they should expect to lose some friends if they havent been active.