From the Document: "As the Supreme Court has recognized, social media sites like Facebook and Twitter have become important venues for users to exercise free speech rights protected under the First Amendment. Commentators and legislators, however, have questioned whether these social media platforms are living up to their reputation as digital public forums. Some have expressed concern that these sites are not doing enough to counter violent or false speech. At the same time, many argue that the platforms are unfairly banning and restricting access to potentially valuable speech."
CRS Report for Congress, R45650
Congressional Research Service: https://crsreports.congress.gov/