My new book is out now; you can order it direct from Amazon/B&N or backorder it anywhere.
It answers your questions about today's "political social media platforms"; it's also partly "Radical Economics For Dummies," with a lot of stuff on today's independent "online news" media. Also has stuff on why corporate social media sucks and what's changing (I recommend CoSo and Mastodon).
It's not an anti-Trump screed, just a bunch of facts, take 'em or leave 'em.
Thanks!
https://www.amazon.com/Year-Online-Left-Eric-Saeger/dp/1732583552