Facebook friends Twitter-like trending topics

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Facebook is taking another hint from Twitter and adding a trending topics section.

After adopting Twitter-like hashtags, the social network announced Wednesday that it is now rolling out a series of features that make visible the topics people are discussing on Facebook.

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The new feature will only be available to a small number of U.S. users who access Facebook on the mobile Web (m.Facebook.com).

The trending section will appear at the top of the News Feed on the mobile site and will generate popular trending topics with and without hashtags. The new feature will rank the topics in a way that allows the user to see the stuff that their friends shared with them first before public posts related to the topic.

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Twitter has a similar unit on its desktop and mobile platforms where it makes visible what people are talking about on the network.

This isn't the first time Facebook has tried to mimic Twitter. Mark Zuckerberg's company has introduced searches via hashtags to its platform, like Twitter features, and also recently introduced video to Instagram, which many considered to be a direct rip-off of Twitter's Vine app.

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By CNBC's Cadie Thompson. Follow her on Twitter @CadieThompson.