Selected answers from the Dumb SEO Questions Facebook & G+ community.
Devin Peterson: I would highly doubt it. I`m sure they are well aware that blogger sites can be just as awful as any other blogs and they probably wouldn`t risk artificially inflating crappy sites just because its their own platform. This would generate poor search results, and compromise the quality of their search. This doesn`t necessarily mean that they have altruistic intentions all the time, but providing good results is how they dominate the industry.