I run a article directory and  allow users to submit their own post.  Alot of them are submitting spam with the same keywords in the subject line. IS there a plugin which can auto delete those articles  ? Â
So you would want a plugin that detects the keywords and then matches them against the title? Is this right? If so I don't think you are in luck off hand because of lack of keyword detection scripts. Plenty of tag discover devices but not any google-based-keyword-discovering devices that i know of.Â
There're plugins to delete spam commet automatically, but for article you have to delete manually. As suggested above, you can try with CAPTCHA before the user submitting.
There is not any kind of plugin as per your requirement. i have same problem like you. But i am helpless. Just because of junk contents, i stopped new registration, also disable instant approval to maintain my article directory quality.
I also want such a plugins as almost more than 500 articles are coming daily on my site, and it is not easy to handle such a large spam articles every day.