I had nickname in a conversation, and emoji set and color. I deleted the conversation when we still had nicknames set. Today I enter to our messenger page and all the sets were deleted. Like he removed them but I didn't received any notification. Also, I tried to find him on Facebook from my phone, and he is the online person that when I click to his profile, instant block my Facebook application with the message Facebook has stopped. And other person can't find him and see his timeline. I can also see his timeline from my computer, but not from my phone. From my PC, when I entered to our conversation, it seems that I can not add any nicknames or colors, but I can fix them with other persons. Anyone knows about this trick? Facebook didn't notify me that I was reported or something.