Twitter is where the president lies about US elections and says a lot of his racist things and endorses violence. And Twitter more or less lets it go, so that's not great.
I stayed away from twitter until about a month ago when boredom set in. I found it utterly fascinating during the BLM protests. It's amazing to be able to follow political leaders and journalists and see the evolving discussion. But yes, gosh, so so much blatant racism, trolling, etc., it is just miles apart from the general level of thoughtfulness on, say, HN.
I was on Twitter for the BLM protests too. Traditional media - even most new media - cannot keep up when events are happening that quickly.