Turkey is reportedly blocking access to Twitter, Facebook, WhatsApp, and YouTube following the arrests of at least 11 pro-Kurdish politicians.
According to Internet monitoring group Turkey Blocks, access to these sites has been throttled at the ISP level and is apparently affecting "the majority of Internet users." The current Internet user headcount in Turkey is understood to stand at more than 47 million out of a population just shy of 75 million.
Its most recent report, posted on Thursday night, says that almost all major ISPs--starting with national provider TTNet and Turkcell--are affected. Users of UyduNet and some smaller providers were apparently still online, at time of testing.