Collective intelligence. Think of how Wikipedia works, how Amazon harnesses user annotation on its site, the way photo-sharing sites like Flickr are bleeding out into other applications... We're entering an era in which software learns from its users and all of the users are connected.
Facebook has now firmly established itself as a hub on the internet, making it a destination for surfers to do multiple tasks such as communications, gaming, shopping, photo-sharing and information gathering.
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