At last, I have now gone through all of the unpublished comments that have built up on this blog over the last few years and marked most of them as spam. The automatic filters got a lot of them but they left me with quite a collection of verbose comments to sift through – these appeared to be autogenerated ‘medical-ish’ language scattered with links to comments on other peoples blogs. While I didn’t follow any such links, I am guessing that they were similarly constructed. This appears to be an attempt to game the Google relevance algorithms by creating a web of pages that link to each other.
Anyway, this means that any comments you might leave from now on will get a bit more attention as they won’t get lost in the morass of spam.