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Splogs Clog Blog Services
SuperWebTech writes "A new generation of spam has emerged lately in the form of automatically-created spam blogs, or "splogs." One wily programmer manipulated Blogger's API to create a "spamalanche" of thousands of blogs whose sole purpose was to increase their real sites' pagerank. This clogged search engine results while filling RSS feed services with useless listings. Though Google, Blogger's owner, is doing its best to fix the problem, in the meantime several services have stopped listing any site they host. So far nobody has found a solution."
Flag all usernames that meet that basic regex criteria.
With all the efforts spammers do to avoid baisian filtering on e-mail, don't you think they will change their username format to something else half an hour after you implement this regex? Probably to something more variable (and dictionary based).
Hand filter that bunch.
And hand filtering thousands of blogs which are created automatically does not seem feasible...