Observed being fired around via email, pasted to blogs and forums....pretty much everywhere you can imagine:

"If someone by the name of Mark Genesis Gallardo (rugbylegend) wants to add you to their list, don't accept it. It's a virus. Tell everyone on your list because if somebody on your list adds them you will get it too. It is a hard drive killer and a very horrible virus. Please pass this on to everyone on your list. We need to find out who is using this account. Sorry for the inconvenience. Right click on your group name of your buddy list and click Send Message to all. Copy and paste"

Smells like a typical "fake virus warning" to me. Everything from the "Don't think about it, just send this message" hysteria coupled with dubious technical information (you'll be "infected" simply by adding this individual to your contacts?) makes me think this is nothing more than a hoax.

Be careful out there, but don't panic needlessly!