Big battle brews over control of Web social interaction

With about half of Facebook’s 400 million users checking in daily, the social-networking company is one of the Web’s most popular destinations. Now it’s seeking to turn scores of other Internet sites into satellites where users can interact with their Facebook friends.

Facebook CEO Mark Zuckerberg is expected to give details of the plan — which involves a variation on its "Share" button already on many sites — at a San Francisco conference for third-party developers Wednesday. But even before Facebook makes its plans public, it will face competition.

By MIGUEL HELFT

The New York Times

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