Tumblr founder David Karp says the social network remains a hub for creative communities because it focuses on four key goals. Speaking at South by Southwest Interactive, Karp cited the need for customizability and flexibility, and the value of setting a particular tone. "Karp's intense focus on the network's community means creatives will likely continue to find Tumblr's pages filled with the latest tools and new, interesting creations," SmartBrief's Stephen Yusko writes.

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