Despite largely anecdotal media speculation, it’s not clear how the acquisition of Tumblr by Yahoo for $1.1 billion will be greeted by users of the New York blogging service. But rival blogging service WordPress’s founder Matt Mullenweg posted a blog last night that said that imports from Tumblr to his service on Sunday had risen from a typical 400 to 600 blog posts an hour to more than 72,000. Whoa! That said, this is not an uncommon occurrence. Some users of Posterous fled the blogging service when Twitter bought it, and some Instagrammers huffed off when Facebook nabbed the photo-sharing site. And, by comparison, Tumblr says it get 75 million blog posts per day — so 72,000 are just a drop in the ironic blogging ocean. Plus, Mullenweg thinks the high price paid by the Silicon Valley Internet giant was low.