There is a lot of hacking going on in messenger. I was communicating with what I thought was my sister and all of sudden she was recommending some product to buy. I realized it wasn't talking to my sister at all. Another time one of my friends was trying to start a conversation, I asked him later if he had try to reach me and he said no. Obviously they're using your friend list as bait to go phishing on IM. These situations have happened to me too many times. Use another means of communicating.