Microsoft has done stuff like this with MSN messenger for as long as I can remember. At least five years. The specific sites that are blocked frequently include

Microsoft has done stuff like this with MSN messenger for as long as I can remember. At least five years. The specific sites that are blocked frequently includes entirely harmless ones. Between blocking messages "for users' own good" and other technical issues (80% of message I send to certain users are dropped silently), MSNM is by far the least reliable messaging system out there. Nobody should be using that piece of shit in the first place.