Where they differ: Steemit allows abuse and harassment, while Twitter bans it. Steemit bans no one. Twitter bans comservative politicians like Milo Yiannopolous. Here is some nice propaganda of why Facebook and Twitter can't ban ISIS
http://www.wired.com/2015/11/facebook-and-twitter-face-tough-choices-as-isis-exploits-social-media/
while simultaneously banning western joirnalists for allegedly abusing and harassing others.
http://www.zerohedge.com/news/2016-07-20/milo-yiannopoulos-responds-twitter-ban
ISIS would never abuse or harass. Behead and torture maybe, but abuse or harass?
NEVER!