That's pretty much what Facebook said late Monday by changing the policies it insisted did not need to be changed in order to stop the suppression of news stories that appear favorable to conservatives in its Trending Topics section.

Reuters:

Facebook Inc (FB.O) said on Monday that it had changed some of the procedures for its "Trending Topics" section after a news report alleging it suppressed conservative news prompted a U.S. Congressional demand for more transparency.

The company said an internal probe showed no evidence of political bias in the selection of news stories for Trending Topics, a feature that is separate from the main "news feed" where most Facebook users get their news.