The Guardian has confirmation on the social media shutdown:
Access was restricted in Turkey on Friday to Facebook, Twitter and YouTube shortly after news broke that the military coup was under way, according to two internet monitoring groups.
Reuters reported that Turkey Blocks, a group that monitors internet shutdowns in the country, and Dyn, which monitors internet performance and traffic globally, both said it was difficult or impossible to access social media services in Turkey.
The Turkish president Recep Tayyip Erdoğan has previously restricted access to some social media platforms.