woah what&#x27;s up with you people downvoting? I just pointed out what is true and wasn&#x27;t even trolling. I&#x27;m offended, HN. Uber is a marketplace. Facebook is a social network. Craigslist is a marketplace. Uber&#x27;s network effect works the same way Craigslist&#x27;s does, and is not so much similar to Facebook&#x27;s network effect.