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Before you enter a tag in the search field, the Tumblr app displays tons of random posts that are great for browsing.
On the Home screen you get all the latest posts from people you follow.
Hit the post button, and get colorful icons for each of Tumblr's main post types.
When you touch the photo or video icons, you'll be directed to either choose from your iPhone library or take a new picture or video.
When you just want to get a quick update out, it only takes a few taps to add a title and tags, then publish.