"Tumblr finally started rolling out ad products in 2012, starting with Highlighted Posts in February, which function like promoted posts on Twitter and Facebook

"Tumblr finally started rolling out ad products in 2012, starting with Highlighted Posts in February, which function like promoted posts on Twitter and Facebook. In the following months, the company rolled out several additional features, including a Pinned Posts, Radar and a premium analytics tool for brands and marketers that costs $500 per month." http://mashable.com/2013/01/02/tumblr-revenue-13-million/ http://mashable.com/2013/01/02/tumblr-revenue-13-million/