Tumblr is a microblogging and social media platform. Users publish multimedia posts on short-form blogs and follow other blogs, and new posts appear in a live feed on their dashboard. The platform was founded in 2007 by David Karp and is offered as an online service.
Tumblr is owned by Automattic, which acquired it from Verizon Media in 2019. According to Wikipedia the company is based in San Francisco, and its privacy policy describes Tumblr as an American company. The policy states that user data is collected and processed in the United States, and it names no EU storage location. For EU users, Tumblr, Inc. is the responsible controller. As a US service, Tumblr can fall under US law such as the CLOUD Act, so European organisations should weigh this before sharing confidential or business content on the platform.