Twitter has launched its IPO, and that means the world suddenly has access to a lot of previously-secret information about the popular social media site. The data show that the social media site has grown at a steady, but not spectacular, rate over the past three years. The number of active users has grown from 30 million in 2010 to 218 million today:

Those users have generated a growing number of pageviews. In the second quarter of 2013, Twitter delivered 150 billion timeline views, not quite double the 89 billion timeline views delivered during the second quarter of 2012: