Viral and limitation don't go hand in hand. Paul Buchheit made this point realy well in his startup school talk couple of years ago: http://www.youtube.com/watc

Viral and limitation don't go hand in hand. Paul Buchheit made this point realy well in his startup school talk couple of years ago: http://www.youtube.com/watch?v=EZxP0i9ah8E#t=21m56s http://www.youtube.com/watch?v=EZxP0i9ah8E#t=21m56s