I do not know if a bipolar person can develop paranoia but I have it. Sometimes I notice a thread that stands out in some way. I could not put my finger on it until tonight. Just for an example, sometimes I will notice someone in a forum who asks the members in one of the most intimate forums a question that upsets some of the members. The members post all their painful memories anyway. The posters do not seem to realise that this poster is new, does not offer any information about themselves but seemingly asks a question that a genuine poster would never ask their fellow members because the way it is done looks harmless, but is designed to provide the original poster with posts that caused the responders great personal pain in recalling the memories to share with the unsuspected troll. The troll by nature gets off on other peoples worst pain. Sadists. I wrote paranoid on this because someone could come along and say "you do not know that for sure". Or having a troll's buddy turn a thread into a moderator. ?