The trick is to give people something they want to tell their friends about. The more viral, the better. It might start with a few geeks but once it's got out t

The trick is to give people something they want to tell their friends about. The more viral, the better. It might start with a few geeks but once it's got out to non-geeks it'll spread. Obviously viral will only help you if you have something worth sticking around for. Otherwise you'll just drum up a huge bandwidth spike and nothing to show for it. Facebook app was the perfect example of getting it right. While it was still novel (rather than annoying) the ability to invite people to use apps (and Facebook) was interesting enough to a lot of people they did share it.