Hi, my 2 cents on the "spam" issue. I guess it is how you define it, but generally I define spam as unsolicited communications that I don't want!
Bit harsh, but there you go! :-)
I joined a group on Facebook which was relevent to something in my personal life (it was do to with a particular bar that I used to frequent), and then found out that the creator of the group was sending regular messages to the members of the group about all kinds of events and bar-nights etc in London ... NOT related to the bar in question.
This got right up my nose, I put a posting on the Wall asking her to stop sending marketing messages to the group ... to which a few days later I got a snotty email ...