Agreed with danieltillet.  Also, an assertion of fact without any explanation or supporting evidence is not particularly constructive.  If you had included this part in your original comment it may have received fewer downvotes:<p>&gt; 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.