Politicians do not care about the ramifications of this. They only care about granting themselves power over who sees what when through the guise of combating hate speech, terrorism, child porn, etc. Posting a blog about this will change nothing.
https://newsroom.fb.com/news/2018/01/trusted-sources/
This is a damned if you do, damned if you don't scenario.
But that's an argument against monopolies, not against social media per se.
https://www.politico.eu/interactive/voters-turnout-in-the-eu... I can't get this to work but I gather the figures are not impressive.