[unalone]

You make something that's so good you want to use it. You have your friends use it too.

If your product's so shitty your friends won't use it until their friends are there first, then you've made something bad and should fix up your product.

(My mock social network had 10,000 users in a month, and I got them all from posting a link to a blog with a few hundred users. We went viral fast.)