I've been studying spam, in Blogger blogs, for over 5 years . This year, we've seen improvement in the automated spam classification process, implied by a noticeable reduction in spam review requests overall - and in a reduction of false positive classifications . During the past few months, blogs requested for review are 2 or 3 times more likely to be confirmed as legitimate spam blogs (true positives), compared to this time last year.
What Blogger won't tell you