Facebook's news feed is 7 years old this month, and users have gone from hating the change brought by the technology to it being "the reason hundreds of millions of us go back to the site every day," Farhad Manjoo writes. The news feed has also become a key tool for marketers and media groups, Manjoo writes, and has shaped not just Facebook but just about every other social network that followed. "Looking back, it's clear that news feed is one of the most important, influential innovations in the recent history of the Web," he writes.

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