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Over 400 new features, fixes, and improvements. Introducing Tumblr 3.0 It’s been six months since we launched Tumblr 2.0. We’ve spent a lot of time looking at the ways you’ve been using Tumblr, want to be using it, and could be using it. Today, we’re delighted to show you the culmination of all your feedback and support. The most powerful and simple application we’ve ever built.