For the first time, I have received, what I believe to be, SPAM through Google Talk on my Android phone. I don't use Google Talk, at all, so I'm 100% positive that this is spam. Upon looking at the notification in the notification bar, I see:
email@example.com wants to chat with you. Will you accept?
This is a vector I haven't seen before, and if anyone has more information, I'd love to hear more.