It finds that Fb's algorithms do sift out some challenging items - but this has a smaller effect than our own decisions to click (or not) on links.
By far the biggest hit to ideologically "cross-cutting" content comes from the selection of our Fb friends.
Other experts welcomed the study but also called for more, broader research.
Critics have argued that this effect, particularly if exacerbated by "social algorithms" that select click able content for us, is bad for democracy and public debate.
"People are increasingly turning to their social networks for news and information," said co-author Solomon Messing, a data scientist at Fb.
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