I largely agree with your sentiments about the spamminess of Facebook, but you got this very very wrong.
Facebook has astonishingly well-run engineering and design operations. What they do in terms of scalability makes Google's operations look like child's play. They are web UI design leaders, and they keep rolling out changes at an amazing pace (they push significant changes multiple times per week). The interface is cluttered yes, but it's cluttered in the same way Photoshop's UI is cluttered, that is it caters to the needs of heavy users.
It's okay and maybe even a moral obligation to hate Facebook for its time-wasting banality, but don't hate them for being good at what they do. Claiming it's all luck is like some kind of playground taunt; their operations blow the vast majority of tech companies out of the water (look at how they ran circles around Twitter). It's good discipline to recognize greatness in companies you don't like, and Facebook has a lot of important lessons for any tech startup.