are no big huge network externalities creating a winner-takes-all market.
Facebook did not kill off other social networking sites and it's got far more externalities than most websites. Once the market is large enough you only need own a tiny slice to make a small profitable company.
Facebook did not kill off other social networking sites and it's got far more externalities than most websites. Once the market is large enough you only need own a tiny slice to make a small profitable company.