I checked out a few of the sites. come grub with us was really cool, they didn't have any yet in my town but I think he is on to something..
5 trends that could take down Facebook
It's hard to argue Facebook's momentum. We are talking about a company that has over 500 million active users, was valued by Goldman Sachs at $50 billion in January 2011 (and $75 billion by secondary markets in March 2011), and is so popular that Hollywood made an Oscar-winning movie about its beginnings. You are also talking about a platform where every month, more than 250 million people engage on external websites, with 80 of comScore's U.S. Top 100 websites having integrated with Facebook.
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Creation of vertical, interest based networks
The very thing that led to Facebook's growth (a standardized and unified experience) could also prove to be a kink in its armor. Gautam Gupta from General Catalyst Partners pointed out to me that "Facebook's market share of time spent on web is driven by the utility it provides to consumers as a social network." This broad social network will continue to have its place, but people are increasingly being drawn to vertical and interest based networks to meet specific needs.