Facebook is the world’s biggest social network, with 1.35 billion users as of December 2014.
But what about the rest of the top 10?
China’s Qzone is second, with its 629 million users almost double that of third-placed Google+.
LinkedIn (332 million), Instagram (300 million) and Twitter (284 million) are next, followed by Tumblr, Sina Weibo, Vkontakte and Snapchat.
Check out the chart below for the full top 10 social networks worldwide, which comes courtesy of Statista.