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David Karp and developer Marco Arment began working on their own tumblelogging platform after Karp had been interested in tumblelogs (short-form blogs) for some time and was waiting for one of the established blogging platforms to introduce their own tumblelogging platform. As no one had done so he began work on developing tumblr.
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Tumblr was launched in February 2007 and within two weeks, the service had gained 75,000 users
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Users could now reblog other users content.
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Bloggers can now like each others photos
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Twitter integrates with tumblr and draft and queue options introduced
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Users can now scroll endlessly on the dashboard and add photo sets
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Option to post to facebook now avaliable
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