I think DreamingofBrie posted most of the ones I would have! @Just_Maths resources and blogs about maths issues @studymaths Jonathan Hall writes the mathsbot and formtimeideas websites. @EmathsUK Mark McCourt - Ex-Director of NCETM, very critical of how Mastery is being implemented, trying to solve the qualified maths teacher shortage by building a fully resourced maths curriculum (Complete Maths). @MrMattock Maths head, retweets interesting stuff, good blog as well @MathsEcho - maths echo chamber account retweeting any good maths blogs
@MrBartonMaths was mentioned upthread, he also does podcasts where he interviews prominent maths teachers (and others like Tom Bennett, Dylan Wiliam), including most of the tweeters on this thread. They are long, but usually interesting mrbartonmaths.com/podcast/
noble, because our PGCE instructors insisted that we needed to be on top of our own Maths to at least GCSE level to ensure we could properly teach primary Maths - so it's to keep my hand in, really. I'm also a. interested generally and b. I like to know what's going on at that level in secondary.
Oh, and why Maths, rather than anything else? Well, I looked at my Twitter feed and I have a lot of English already. Other subjects, I'm happy to be general interest about (don't want Twitter overkill).