You can’t go 5 minutes without hearing another story about the impact of social media on… well… everything. How it changes the way we communicate. How it changes the way we shop, engage customers, learn about partners and competition. The list goes on, and on, and on.

At the center of most (if not all) of these stories is Facebook. Certainly the most popular and broadly recognized social network, Facebook now boasts hundreds of millions of users, over $1 billion in revenue, and over $50 billion in value for its owners. But one could argue that its greatest impact lies in one simple feature.
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