David Karp was 19 years old and working through a gap between consulting contracts when he built Tumblr in 2007. The concept was deceptively simple: a microblogging platform where users could post text, images, GIFs, audio, and video to their own customizable "tumbleblogs," and then reblog anyone else's content to their own feed. It sounds modest on paper, but what it actually created was something the internet had never quite seen before.
Through the early 2010s, Tumblr exploded in popularity. By 2014, its users were publishing at least 84 million posts every single day. It had become the spiritual home of fandoms, memes, social justice movements, creative writing, and a particularly unhinged strain of humor that couldn't quite exist anywhere else.
The site's rise was significant enough to catch the attention of Yahoo, which snapped it up in 2013 for a staggering $1.1 billion. Yahoo's then-CEO Marissa Mayer expressed unbridled optimism about the acquisition, but the two companies were never quite a natural fit, and Yahoo struggled to integrate Tumblr with its other operations in any meaningful way.
Verizon inherited Tumblr as part of its 2017 acquisition of Yahoo. That same year, Karp stepped down as CEO. Things were already not going particularly well. In 2018, Apple temporarily pulled the Tumblr app from its App Store after the platform was found to be hosting content that violated child safety policies.
Tumblr and Verizon leadership responded by banning all explicit content, but the ban satisfied neither users nor advertisers. Within months of the decision being announced, the platform's traffic dropped by over 30%. The 84 million daily posts of Tumblr's peak had already fallen to around 30 million by 2018, and the vibe never fully recovered.
By August 2019, the site that had once sold for over a billion dollars was purchased by Automattic, the parent company of WordPress, for the bargain price of $3 million. It is one of the more spectacular devaluations in internet history. Automattic CEO Matt Mullenweg said his company would try to preserve the passion and sense of community that so many people around the world had come to associate with Tumblr. And to his credit, it appears they have. As of 2026, Tumblr still claims around 135 million monthly active users, proving that some things are simply too weird to die.
So what exactly keeps people coming back? A lot of it comes down to what Tumblr is not. Unlike Instagram or TikTok, Tumblr offers deep customization and gives users freedom to fully change themes, HTML code, and layouts, rather than funneling everyone through the same polished, algorithm-driven template where every post feels like an audition. Tumblr has always been looser, weirder, and considerably less interested in making you feel inadequate. Its reblog system, which lets users add their own commentary to a post as it travels across the platform, is at the heart of everything.
