Tumblr's CEO David Karp promised last week that a newly refreshed iOS app was en route, and it's just gone live . The 3.0.0 app has had a very significant overhaul, with integration of clever gestures and tap access designed to make it even easier to blog from a mobile device like the iPhone or iPad, and there's support for higher-resolution images (is this the retina display effect?) and Spotify. Perhaps most significantly there's now support for offline blog creation, letting bloggers put together the elements for a new Tumblog post while not sipping wireless data, and then pushing it live when they're on a network again. Tags have also seen a big change, with the ability to search via tags on mobile leading to "massively increased" levels of blog discovery, according to The Next Web . Tumblr has seen massive growth over the last year, with great spurts recently since its implementation of Facebook 's Social Graph in April--a 2.5 times growth  in the month immediately after. It's in a battle for the future of publication with Wordpress and its ilk, and perhaps also with Facebook which is still strengthening its mobile strategy.
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