That's an argument that's in a way true, but it's also a non-sequitir comparison: in order to live in a middle class suburb (or especially a middle/upper class section of an urban area, e.g. Pacific Heights in San Francisco) there's a very high monetary barrier to entry. There's no monetary barrier to entry for Facebook (especially since it's no longer just for college students-- which may have been the seedling of the current phenomenon).