Facebook is a public company now, which means it has to operate like a business. Their decisions will be in favor of maximizing shareholder value in order to succeed as a publicly traded company. Thus far, their monetization strategies have been contradictory to the essence of a social network by infringing on the virtue of social interaction. The passion is no longer about how can we connect the world, but how can we get people to spend money. If you can’t hang out with your friends without being bombarded by promotions, you’re going to go somewhere else that’s free, easy, and trendy.
Facebook is stale like email but like email it'll persist with its basic utility as a networking hub.