recaptcha is used at signup only to avoid bots registering. we had that.
The captcha-System is also activated when posting/editing URLs. And thats the problem.
On your request captcha on adding links to the wiki has been removed for now. We will see how it goes and evaluate it when we have experience with it. Please read about external links on the Help:Links page. --max 17:19, 20 April 2011 (CEST)