I received an IM from someone I didn't know once so I said who is this. They said all these creepy things like to go on a chat room and stuff so I blocked them knowing it was not safe. Then a few weeks later it happened three more times coming from user names like:aeubie, ayu1975 and bgblanks. They all said: hey I tried to send you a message but this stupid im  freezes MSG me on my other aim it's foxxxie23 I can talk there easier lol. Is there a way I can stop this from happening and also why are they sending this to me???