Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: David Karp (an haife shi a ranar 6 ga Yuli, 1986) Ba'amurke ne mai haɓaka yanar gizo kuma ɗan kasuwa. Shi ne wanda ya kafa kuma tsohon Shugaba na gajeren tsari na dandalin rubutun ra'ayin kanka a yanar gizo Tumblr. Karp ya fara aikinsa, ba tare da ya sami takardar shaidar makarantar sakandare ba, a matsayin mai horarwa a karkashin Fred Seibert a kamfanin zane-zane Frederator Studios, inda ya gina dandalin rubutun ra'ayin yanar gizon farko na studio kuma ya yi tunani, ya rubuta, kuma ya shirya cibiyar sadarwar bidiyo ta farko ta intanet, Channel Frederator. Karp ya ci gaba da aiki don dandalin iyaye na kan layi na UrbanBaby har sai an sayar da shi ga CNET a 2006. Karp sa'an nan ya fara kansa software tuntubar kamfanin, Davidville, inda ya yi aiki tare da kwamfuta injiniya Marco Arment a kan ayyukan ga abokan ciniki. A lokacin rata tsakanin kwangila a shekara ta 2006, su biyun sun fara aiki a kan shafin yanar gizon microblogging, wanda aka ƙaddamar a matsayin Tumblr a watan Fabrairun 2007. Ya zuwa 1 ga Nuwamba, 2017, Tumblr ya dauki bakuncin sama da shafukan yanar gizo miliyan 375.4. A watan Agusta 2009, Karp an kira shi Mafi Kyawun Matasa Tech Entrepreneur 2009 ta BusinessWeek kuma a 2010, an kira shi zuwa MIT Technology Review TR35 a matsayin daya daga cikin manyan masu kirkiro 35 a duniya a karkashin shekaru 35.A ranar 20 ga Mayu, 2013, an sanar da cewa Yahoo! da Tumblr sun cimma yarjejeniya ga Yahoo! don sayen Tumblr na dala biliyan 1.1. Karp ya kasance Shugaba na kamfanin. Karp ya sanar a watan Nuwamba 2017 cewa zai bar Tumblr a ƙarshen shekara.  Tambaya: yaushe aka kaddamar da Tumblr?
Fabrairun 2007