A good possibility is that some of the folks that a member might  communicate with thru the site could have a virus that has grabbed their address-book & gone crazy with it.  That's a very common source of emails for spammers these days.

 

And it could be it's no accident that folks you "know" or have communicated with are also getting Spammed."

Renderosity does not distribute email addresses, No One on our staff . And our site has not been hacked.