Dive summary: 

• The widely popular blog network Tumbler will be moving into the mobile marketing industry this year in an effort to increase revenue streams. 
• The transition to mobile ads in a natural one after Tumbler began allowing for advertisers to pay for prominent placement last year. 
• The mobile advertising will be similar to web versions and will only include prominent posts. 

From the article: 

"Last year, Tumblr began allowing advertisers to pay for prominent placement – a process that kick-started an inevitable transition into the mobile ad realm. The company expects to make its fist annual profit this year once it extends the advertising platform to smartphones."