Yesterday, Facebook revealed the names of 12 media companies launching social reader apps on Timeline. Seven of them are news-themed.

The Guardian and the Washington Post were two of the biggest names to first experiment with social readers. So far, almost 6 million people have signed up for and installed The Guardian‘s news app, says Martin Belam, the news organization’s lead user experience and information architect. More than 5o percent of users are under the age of 24.

“The app is putting our reporting and features in front of the grown-up audience of the future,” Belam recently blogged.

Justin Osofsky, Facebook’s director of media partnerships, concurs that the apps have, so far, shown “significant increases in traffic and engagement.”

“These apps create new ways for readers to discover content, while giving publishers the opportunity to reach new audiences,” Osofsky wrote in a blog post announcing the newest additions to Timeline. “They’re built around news and content people care about and identify with and provide easy ways to control the social experience.”

So, who are the new news apps on the block?

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