For a large portion of the population, Facebook IS the web. You say it adds no value. I say it adds a ton: Facebook is their Google. Without "a google" - something to make sense of this mess of trillions of pages, the web is damn useless. Google might be your Google, but Facebook is their Google, and becoming more people's Google every day. Sure, you can slot another company into Facebook. But you could do the same for Google too. Doesn't mean they're useless or scams.
Most importantly, Facebook is the small town local web that never really happened anywhere. Or rather: that happened everywhere, but only exactly once, being outdated ever since, complete with mandatory "under construction" gifs and a forum where the last post is an advertisement for some polyphonic ringtone scam.
