Six Apart which produces the Moveable Type publishing system and TypePad blogging service raised $10 million in venture funds in October. Today it announced the purchase of LiveJournal, a blogging service built on open source that claims 2.5 million users. Together they have 6.5 million blogs, according to TechNewsWorld.com. That seems way high, considering that Pew Research says about 8 million U.S. adults have a blog. (The vast majority of them only post once, however.)