Twitter is a real-time online social networking platform founded in 2006. As of 2012 it reported over 500 million active users generating over 340 million tweets daily, making it one of the world's most visited websites. 

Screen shot of Pope's official twitter account. Photo: SCMP

Pope joins Twitter with pontifex handle

Pope Benedict XVI is joining Twitter promising “pearls of wisdom” in eight languages under the handle pontifex, the Vatican announced on Monday.