Tumblr is an immense sea of valuable, publicly available user data just waiting to be tapped by marketers interested in how the cool internet teens use their products, just search “Starbucks” to see what I mean.Tumblr, it seems, is also ready to help corporations cash in on its users’ impeccably curated tastes. It just inked a deal with Ditto, a company that scans images on the web for branded products and sells the results to multinationals like Coca-Cola and Kraft, and part of the deal involves giving Ditto wholesale access to all of Tumblr’s photos.