I got invitation in Orkut. I actually ignored the first invitation, but when i got the second msg, checked out the TAI(OLD) webpage, and found it quite interesting and registered on the first visit itself.
Was browsing looking for some reviews of a few cars. Found TAI and registration was a joy. At somebody allows people to register without asking or a big story for a reason to join!! This was one of the points I was really impressed with TAI.