140 Proof expanded its social advertising technology today by launching what it calls Native Ads for Social Sites, allowing advertisers to reach targeted consumers on an array of social networks including Tumblr and WordPress. The addition of Tumblr to the company’s arsenal is of particular interest as it allows ads delivered in “native” format to be reblogged and shared like any other post, while also taking advantage of strong targeting, and Tumblr’s largely unexploited advertising potential.