Nah, the magic sauce (IMO) was the progressive roll-out. When only .edu addresses were allowed in, it was exclusive and regular joes were desperate to get in. G

Nah, the magic sauce (IMO) was the progressive roll-out. When only .edu addresses were allowed in, it was exclusive and regular joes were desperate to get in. Google successfully pulled the same stunt with gmail, but failed dismally with google plus.