How is it an anti-pattern? That's how Dropbox launched, and it seemed to turn out OK for them. Generally speaking if you have a hard-to-scale service (Heap, Dro

How is it an anti-pattern? That's how Dropbox launched, and it seemed to turn out OK for them. Generally speaking if you have a hard-to-scale service (Heap, Dropbox) doing an invite-base system makes sense.