I think Twitter lists are a good starting point. There are plenty of ML/AI lists around. I start from there and whittle down to good signal/noise ratio, meaning avoid people who post overly frequent fluffy hot-takes. People who retweet good stuff are also worth a follow. Ultimately what I want to get out of twitter is tools, papers, good blog-links.

For specific research-oriented follows I would suggest starting with Ilya Sutskever and see who he is following or retweeting. And for practical stuff start with Simon Willison