Counterpoint: Twitter is the preferred social media among scientists, and a good place to keep up with the latest papers and developments. The quality of discussion on science twitter can be pretty good too, despite the character limit.
I'm skeptical that anybody's Twitter is on par with the quality and engagement you see from something like Terrance Tao's WordPress blog. Unless you're including the linked content for preprints and the like, I just don't see it. The depth just isn't there. As a way to survey news in a field, sure, twitter definitely has value but the content on Twitter itself isn't really what I'd consider quality.
