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Facebook is adding commenting, a much-requested feature to the “like” button it has spread across millions of sites.

Before, publishers had to choose between the older “Share” button, which had comments, and the new “Like” button, which didn’t. If you’ve implemented the iFrame version of the button and want to enable comments, you need to use the standard layout and make sure the button is about 450 pixels wide. Facebook says comments lead to higher distribution and referral traffic.

The company unveiled the “Like” button back in April at its developer conference as part of a broad plan to track the tastes and preferences of its now 500 million users. The company told us earlier this month that it now serves 3 billion such buttons a day, up from 1 billion at launch.

Facebook is also adding the ability to publish content to users that “like” brands or objects through its Graph application programming interface. So, if you’re a brand that wants to send out a deal to fans of a set of products, you can publish that update to fans of multiple Facebook Pages. The company is also adding better analytics so it’s easier for publishers to test placement of the buttons.

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