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You are aware that there are more people not on facebook than people on facebook, right?

A service with an addressable market of the entire Internet is very rare.

Usually your addressable market will be something like: "English speakers over the age 22 with household income of at least $30,000 per year."

And then suddenly more people are on Facebook than not.

I am. What you're probably not aware of is who my market is (hint: 90% of them have facebook accounts).

How do you know 90% of your market has a Facebook account when 100% of your registered users are required to have a Facebook account? Don't allow your user base to be restricted by another user base.

Reply on news.ycombinator.com