Matthias Kirschner wrote:
Thank you all for you comments until now. I have not yet understood what the big disadvantage of the current system is, and what the advantages of the others are. Until than I think I will stay with the current solution, although sometimes it might take a few hours until I can approve a comment on my weblog.
Do you understand what Spam Karma 2 does?
This big disadvantages (plural!) of Spam Karma 2 are:
1. the captcha discriminates against users with disabilities, which is only sometimes illegal but always unfair;
2. the basic tests of "spamminess" easily cause a false positive because comments score spam points: - for giving an comment author URL; - for giving any other URLs; - for refusing to execute javascript; - for typing things that look a bit like HTML; - for submitting a comment too quickly after loading the page (which you might do if someone posted the entire blog entry to a list and it was a short comment); and other non-spam heuristics.
3. the RBL plugin still defaults to looking up against blbl.org - which closed in 2006 http://jamesoff.net/site/2006/09/26/ive-had-enough/ - and the opm.blitzed.org service - which I think isn't free software.
The advantages of other methods are that they are:
1. open to all;
2. tests the comment for actually being spam;
3. 100% free software.
Hope that explains,