WSJ Social on Facebook
The Guardian:
The Guardian on Facebook
Building on Guardian News & Media's recently-announced digital-first strategy and pioneering open approach to journalism, the Guardian is now among the first companies to make the news industry more social. The new Guardian Facebook app integrates with Facebook's Open Graph platform and the Guardian API, enabling Facebook users to read and experience Guardian content without leaving Facebook.
That means that all the familiar Facebook functionality is there as well – see the faces of other people who have interacted around the same content, discover news stories filtered by your social graph; comment, like and share articles, plus become a fan of specific Guardian and Observer sections to be alerted to the latest content you're interested in.
If you choose to use the app, then when you follow links on Facebook to the Guardian's website, you will be shown the content on a Facebook page. This enables you to see what your friends are also reading from the Guardian, and what is proving popular from the site among Facebook users.
The Washington Post:
The Washington POst Social Reader App on Facebook, include Mashable updates.