I don't think that Facebook will sink. However, since it's spread itself so thin over so many different areas I think that some startups might come in a become

I don't think that Facebook will sink. However, since it's spread itself so thin over so many different areas I think that some startups might come in a become bigger players. It's kind of like Myspace. Facebook did a good job destroying their > 18 demographic, but it still has a strong following amongst teenagers (source: many younger cousins)