I was going to post an excerpt but an edit does not to this subject justice.
In short, liberals fear the Right is starting to hold old social media posts over their heads and pushing them to play by the same rules they brutally used on their political foes.
NYT editor even argues the practice is "anti-free speech" if you can get your mind around such an insane statement.
https://thehill.com/opinion/technology/460595-liberals-haunted-by-social-media-tactics-they-use-against-the-right