Growing a list of Twitter accounts you follow will be an ongoing process. Still, if you need a couple of accounts just to seed and fill out your Twitter feed at the start—because Twitter kind of forces you to at the get-go—here are a few suggestions.
Here’s the Explore MTBoS account and those of the four organizers:
@ExploreMTBoS
@crstn85
@jreulbach
@samjshah (keeps his twitter account protected/private)
@j_lanier
Here are the leaders of the many mathematical chats that happen weekly on Twitter:
Middle School: @justinaion, @luvbcd, @shlagteach
Algebra 1: @lmhenry9, @_MattOwen_ ,@aanthonya, @kathrynfreed
Algebra 2: @druinok, @wmukluk, @lbburke
Geometry: @algebrainiac1, @barbarawmadden
PreCalculus: @mrlenadj, @untilnextstop
Calculus : @ajitmishra71
Statistics: @jkindred13
And here are a few other MTBoS-related accounts:
@globalmathdept
@tmathc (Twitter Math Camp)
@carnivalofmath
@mythagon (Infinite Tangents podcaster)