so did myspace, so did AOL. it is just an re-implementation of existing ideas and products. Nothing it offers is new or anything we haven't had for decades. Sure, a lot of people use it NOW but that will change just like it did for myspace, AOL, and plenty of other platforms. And those marriages/partnerships/business/etc don't exist BECAUSE of facebook, they exist because people started them and now they USE facebook as a tool, if facebook died tomorrow and was replaced by a new web-based-communication-and-advertising tool all of those things would still exist and all the marriages/partnerships/businesses/etc would shift to that platform, they wouldn't cease to exist. It doesn't create any value in any sort of dynamic new way, it is just a re-implementation of the same tools people have been building since the start of the internet. Everybody survived the death of those other tools just fine, no "value" was lost.