WASHINGTON—Chief executives of the largest social media companies will testify Wednesday before the Senate Commerce Committee in a hearing examining their platforms’ role in shaping political discourse.

Less than a week before Election Day, members of the Republican-led panel are expected to question Facebook Inc. CEO , Twitter Inc. CEO , and , CEO of Google and YouTube owner Alphabet Inc., about their treatment of politically charged content, from advertising to news to candidates’ posts.

The…

This post first appeared on wsj.com

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