The "AstroThreadBR" hashtag is a project created by Geisa Ponte and Ana Carolina Posses Nascimento to encourage brazilian people on Twitter to learn more about astronomy. They started making Twitter threads (messages linked to one another, since Twitter only allows 280 characters posts) on hot astronomy topics, and it became so popular that everyone started writing their own threads!
Always using a fun vocabulary, gifs and memes, they keep writing threads and so do we, other astronomers who wanted to be part of it too! For more information about #AstroThreadBR, check out Geisa's website. For the official Twitter account with every thread ever written, click here. And these are a few threads I have written so far, in Portuguese: