If you define “small” as under 30k then @Astropartigirl, @_Astro_Nerd_, @HeckPhilly, @PinkRocketship, @mcnees, @drskyskull, @NuclearAnthro, and @generativist all fit the bill. Lots more, too, in my follows...
Of course, I wouldn’t mind a follow either. 
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I mean, there’s also
@SusannaLHarris,@starstrickenSF,@astronaia,@astrogrant,@nuclearkatie,@biologistimo,@jessphoenix2018,@aussiastronomer,@physicsmatt,@AnnaGHughes,@RealBrianLouden,@OdedRechavi,@Alex_Parker, and rocurs@iamscicomm,@astrotweeps, &@realscientists... -
thank you Amir!!!
End of conversation
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