WordPress co-founder and Automattic CEO Matt Mullenweg called the company’s Tumblr acquisition his biggest failure — but one he hasn’t given up on yet. The comments were made at the recent WordCamp Canada 2025 conference, where Mullenweg went live for a Town Hall session to connect with the open source-focused WordPress community.
The exec noted that Tumblr was still on a different technical stack than WordPress — something he had intended to correct by migrating the back end to WordPress infrastructure. However, that massive undertaking was put on hold earlier this year, as the cost to move Tumblr’s half-billion blogs would be difficult given that the blogging
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