Clay Johnson over at DFA just sent me these Alexa "traffic comparisons":
Truly amazing. In the space of 3-4 days, Orkut went from off the radar (ranked greater than 100,000 most visited site) to number 772!!!
(At the moment, Friendster is 218, Tribe is 4,493 and LinkedIn, off the radar, is 125,816.)
(Also at the moment, Orkut is down for "improvements"...)