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Tumblr to move its half a billion blogs to WordPress
(techcrunch.com)
This is a most excellent place for technology news and articles.
Matt Mullenweg effectively is the 'owner' of both, yes. Though the term 'owner' isn't necessarily precise, it effectively conveys the idea.
Ah sorry, it sounded like you were reacting to the comment you replied to, which it was more like you were adding information.