Facebook has a huge user base and has seen its usage figures increase during the past year -- but that growth may not be sustainable in the long term, writes tech analyst Ben Bajarin. As the site becomes more crowded, users are more apt to suffer Facebook overload and eventually decrease the amount of time they spend on the site, he argues. That might open the door for more specialized networks such as Path, Pinterest or even Xbox Live, which offer more limited but also arguably more relevant services.

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