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| 2007 || || Early development || Marcel Molina receives a message from Karp that he is publishing his first "Tumblr" tumbleblog, inspired by Projectionist. Karp format is presented as a new and advanced short-form blogging format in several ways.<ref name="These Screengrabs Show David Karp Did NOT Invent The 'Tumblelog' That Gave Birth To Tumblr"/>
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| 2007 || February 19 || Service launch || In his mother's small apartment located in {{w|Manhattan}}, David Karp launches Tumblr as a free, simplified microblogging service that facilitates the creation of {{w|tumblelog}}s (a sort of short-form blogs), useful for featuring links, short paragraphs and a stream of consciousness style. It becomes useful for users who want to setup quick and easy link blogs or photo blogs.<ref name="a Breif History of tumblr"/> The service is co-founded with Marco Arment.<ref name="Today in Media History">{{cite web |title=Today in Media History: David Karp and Marco Arment launched Tumblr in 2007 |url=https://www.poynter.org/reporting-editing/2015/today-in-media-history-david-karp-and-marco-arment-launched-tumblr-in-2007/ |website=poynter.org |accessdate=12 September 2019}}</ref><ref name="8 Insane Moments on Tumblr That Will Go Down in History">{{cite web |title=8 Insane Moments on Tumblr That Will Go Down in History |url=https://www.geek.com/culture/8-insane-moments-on-tumblr-that-will-go-down-in-history-1764378/ |website=geek.com |accessdate=13 September 2019}}</ref> The consulting arm of Davidville is shut down, and the company is renamed Tumblr, Inc.<ref name="These Screengrabs Show David Karp Did NOT Invent The 'Tumblelog' That Gave Birth To Tumblr"/>
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| 2007 || October || Leadership || Karp shuts down his consultancy business as his work with Tumblr demands more time.<ref>{{cite web |title=David Karp on the importance of mentorship for small business owners |url=https://www.youtube.com/watch?v=-bgu-yT4YeE |website=youtube.com |accessdate=25 November 2019}}</ref>
