I wonder if this is tied to Google's tracking of social networks. My Google account tells me I am connected to over 500 people, 499 of them I don't know, 475 of them now banned accounts by Twitter, none of them added by me.
Why would someone go to such lengths to get "connected" with my twitter (and thus Google) account but never send me a message and what did they do to get banned?
Not completely related, I know, but maybe it is. We'd have to know more about how google is using social signals to be sure.
P.S. if ANYONE knows how to delete "connected" accounts in your google profile I'm all ears, the instructions tell me to get rid of the "connections" themselves, ie disconnect the links, but the accounts are a)banned and b)not mine but they are still registering...
I'm considering unhooking Google completely and starting from scratch, adding just what I have full control over.