Facebook's Like button celebrates its first birthday

Exactly one year after its launch, the Facebook Like button has become ubiquitous across the web and is still installed on thousands of new websites every day.
Facebook first introduced the Like button at its F8 developer's conference, along with Facebook Open Graph and instant personalization. Through the "Like," Facebook spread its social footprint across the web; 50,000 websites installed the Like button in its first week, and that number rose to 100,000 in less than a month.
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