Why is Tumblr popular right now?

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Tumblr is a blogging website. http://tumblr.com/ (as of July 7 at 16:48 UTC)
Category: | Most recent: July 19 at 22:15 UTC | First appearance: February 5 at 21:20 UTC | Last defined: July 7 at 16:48 UTC by @ via Other | Source: Twitter | Permalink

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