In a comparison between Google Blogsearch and Technorati, Scoble noted that he can' tell the difference between real blogs and fake blogs:
I didn’t see any obvious spam, did you? I think there might have been one on Google’s results, but it’s hard to tell spam blog, or splog, from actual real blogs anymore.
If he can't tell if something is spam how will the average blogger? I have seen some stuff that was virtually auto-generated blogrolled by authoritative bloggers.