Gmail is most definatetly a social virus if I've ever seen one.
I remember the good old days of the origional bots on aol. The thinking was if you could JUST GET YOUR NAME ON ONE you'd have 560 emails [or whatever it was] that contained up to 15 meg each of 'warez'. yup.. those were the days.
Then we all moved on to IRC, then to crappy P2P networks like kazaa/grokster/k++ (all same thing by the way) and most reciently bittorrent. yup. maybe the good old days are back. if we want them secure maybe we'll give WASTE a chance.
Until then I wonder how long it will take for people to revert back to the click and send mentality that AOL had us nursing on. With Gmail I don't think it will take long to find out.
If you look at the bottom of Gmail you'll see something like this:
You are currently using 0 MB (0%) of your 1000 MB.
Heres my giving back to the community. many of your very own Gmail invites. first come first serve (of course)
Invite 1 [k2h.admin]
Invite 2 (Stale because you waited too long)
Invite 3 [achi1313]
Invite 6 [bordekar]
Invite 7 [nachiket.bordekar]
Invite 8 [bordekar.nachiket]
Invite 9 [bshripad, from kev]
Invite 10 [tanmay1313, from kev]
Invite 11 [ameyaa from kev]
Invite 12 [ssaagar from kev]
Invite 13 [gadkar from kev]
Invite 14 
Invite 15 
Invite 16 
Invite 17 
Invite 18