Are there books recounting the history of editorial positions put forth by these platforms? I really had no idea where google stood on political issues in the 2000s. I remember thinking they were quite pro-free speech sometimes callously so through that decade. I do remember them putting forth issues on gay marriage when it was a live political issue, though.

Sure, I meant it also mentioning Google. There's a reason why countries are blocking youtube and other USA based social media: they stopped being free speech platforms if they ever truly were, and turned into a just another propaganda delivery channel, where predefined narratives are pushed to the top of every list, depending on your country and what USA government wants to promote there.