Today in media history: David Karp and Marco Arment launched Tumblr in 2007 http://www.poynter.org/news/mediawire/321131/today-in-media-history-david-karp-and-marco-arment-launched-tumblr-in-2007/ …pic.twitter.com/byP8AiwoTh
5:14 AM - 19 Feb 2015
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