Tumblr

Launched in 2007, tumblr became a safe haven for LGBT youth, social justice movements, and a counseling station for mental health issues. For a decade, this micro-blogging platform had more users than either Twitter or Snapchat, but it remained an obscure subculture for nonusers.

Katrin Tiidenberg, Natalie Ann Hendry, and Crystal Abidin offer the first systematic guide to tumblr and its crucial ro...