Akismet has an interesting stats page that shows a graph of ham and spam comments since Akismet started back in October 2005. It shows that about 93% of all blog comments are spam. Akismet is doing a great job for us. I’ve never seen a false positive and only about 0.2% false negatives.

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2. One billion spam comments
3. Akismet does not like me
4. Blog comment spam magnet
5. 5-digit blog spam