There has been a bug report submitted as of last night, strange things are indeed afoot! I started sending IMs to a few people, and something seemed off, but I was not quire sure what. Then I realized. Where was my name? And indeed, the reciever had no idea who this mysterious blank person sending them IMs was! They were able to gather this from clicking my profile button but much fun and hijinks was to be had.
Belaya, if she indeed sees this, has a screenshot from the other side of this glitch.