Tumblr was launched on April 27th 2007 by founder David Karp. Witihin two weeks of its launch it had 75000 users. Lead developer, Marco Arment left the the company in 2010 to focus on Instapaper. In June 2012, Adidas launched an official soccer blog on Tumblr, the first major brand advertising campaign. As of August 20, 2012, Tumblr has over 69.4 million blogs and more than 29.8 billion total posts and it is growing every day.