Excerpt:
Twitter recently blocked a user who posted sharp criticism of Hamas, the militant and political Islamist organization regarded by much of the international community as a terrorist group.
After The Daily Caller News Foundation contacted Twitter to ask why, a representative for the social media giant said there was an error, and that the account's full capabilities would be reinstated.
[...]
"Just in our field, hundreds of anti-Islamist groups and activists have been banned from using digital advertising agencies, suspended from Twitter and Facebook, and demonetised on YouTube," [Islamist Watch director Sam] Westrop said. "Twitter is an important example. Its rules are vague enough to allow censorship to be deployed unreasonably and inequitably. And its censors certainly make use of that fuzziness."