Actually there was some research done on this-- But mostly on tumblr when it had been found out a teenager ad cyberbullied herself into suicide.
https://www.theguardian.com/society/2014/mar/10/self-harm-sites-cyberbullying-suicide-web
"
Tallulah Wilson, a 15-year-old who killed herself in 2012, was caught up in a "toxic digital world", according to her mother, while the parents of
Sasha Steadman, a 16-year-old who died from a suspected drug overdose in January after looking at self-harm sites, said her "impressionable mind" had been filled "with their damning gospel of darkness". [...]"
It can be said the same can be said for Twitter, as the same toxic mindset flows over there too.