After announcing its deal to acquire Tumblr for $1.1 billion, mostly in cash, Yahoo today started to lay out some of the details for how it intends to make use of the property while trying to stick to its promise “not to screw it up.” Expect more advertising by next year as well as more Tumblr content on Yahoo properties, but more of a cautious step as to how Yahoo will deal with some of Tumblr’s more NSFW content. Here are some of the more interesting details revealed in the call: What are Tumblr ads going to look like? Tumblr apparently made only $13 million in revenues last year but CEO David Karp apparently thinks the site is “ready” to make more now that it understands its users, according to Yahoo CEO Marissa Mayer. But she also noted that they will be working from a challenged position, not just because of user resistance but because Karp himself has been “skeptical” about online ads.