Starting this week, users of Tumblr’s iPhone and Android apps started seeing advertisements on the popular social network. The ads appear in a users’ dashboard stream, so they are unavoidable as you scroll through the latest posts from blogs you’re following. The mobile ad placement, which comes about a year after Tumblr first began selling ads, is a bid to leverage the network’s massive user base and move toward profitability. — CNET
Tumblr places ads in its mobile apps.