People hold placards as they protest against Turkey's Prime Minister Tayyip Erdogan after the government blocked access to Twitter in Ankara, on March 21, 2014. Twitter was blocked in Turkey on March 20, just hours after Prime Minister Recep Tayyip Erdogan had threatened to 'wipe out' the micro-blogging service. Erdogan has come under mounting pressure since audio recordings that spread across Twitter and other social media appeared to put him at the heart of a major corruption scandal.  AFP PHOTO/ADEM ALTAN        (Photo credit should read ADEM ALTAN/AFP/Getty Images)