Facebook is planning to launch a "Subscribe" plug-in for third-party websites, making it easier for people to form one-way ties to celebrities, journalists and other public figures who post content to the network but don't have fan pages. That's a big deal, writes Sarah Perez, since it's designed to directly challenge Twitter's follower-based network of user connections. "For Facebook, this is huge," Perez writes. "It means that the company is directly attacking the entire Twitter model head-on."

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