New York Times:

The chairman of the Senate Commerce Committee demanded on Tuesday that Facebook explain how it handles news articles in its “trending” list, responding to a report that staff members had intentionally suppressed articles from conservative sources.

In a letter, the chairman, Senator John Thune, Republican of South Dakota, asked Facebook to describe the steps it was taking to investigate the claims and to provide any records about articles that its news curators had excluded or added.

And:

Mr. Thune’s actions raised further questions about the content seen by the 1.6 billion people who regularly use Facebook. The platform’s growing role as an arena for news distribution has raised some concerns that it could have undue influence over the flow of information, but any effort by the federal government to regulate or investigate editorial decisions could run into First Amendment protections.

And:

“The notion of Congress looking into or investigating how a medium of communication decides what to say threatens on its face First Amendment rights,” said Mr. Abrams, a partner at the law firm Cahill Gordon & Reindel.

This is an incredible display of arrogance. Will Congress investigate the Washington Post for bias? How about Fox News?