Social Media and Public Discourse Concerns

The following excerpt is from an analytical article discussing the influences of social media on public discourse:

"In an era where tweets outpace traditional media reporting, the fragmentation of information has led to polarized viewpoints. Users curate their own news feeds, which can perpetuate biases rather than foster balanced discourse. The implications for democracy are profound as echo chambers reinforce preexisting beliefs, making constructive dialogue increasingly rare."

Based on the excerpt, which of the following reflects the primary concern expressed by the author about social media's impact on public discourse?