This category lists websites only in its subcategories   Please look for the appropriate sub-category below.

A CAPTCHA is a type of test used to protects website services against use by automated programs that might abuse or otherwise take advantage of the service. The idea is to have a simple question that is easy for a human to answer, but difficult for a computer program. The standard technique is to ask users to type in text shown in an image. Typical applications include protecting registration and comment forms.
The phenomenon of guestbooks and blogs and other online feedback tools being filled with "comments" that are really just link droppings placed with the purpose of being noticed by Google.
News and articles about comment spam or how to fight it.

Comment spam is a phenomenon of guestbooks and blogs and other online feedback tools being filled with "comments" that are really just link droppings placed with the purpose of being noticed by Google.

Sites related to cyberstalking and/or online harassment. Cyberstalking is the use of the internet to stalk another person. Cyberstalking involves harassing or threatening behavior that an individual engages in repeatedly after being told that his or her contact is not welcome.
Please only submit sites which contain concrete information about cyberstalking and online harassment. Sites that appear to exist solely to attack an individual or organization will not be included.

Junk mail and spam are not cyberstalking and sites about such activities may be found in Top: Computers: Internet: Abuse: Spam.

Disagreements are not harassment.

Information on denial of service attacks, distributed denial of service, and methods of prevention.

The suggested websites should provide useful information on Denial of Service techniques, identification, prevention or trends.  Avoid suggesting brief, topical articles, unless they present important new developments.

Some websites collect data on visitors to their website. One bit of gathered data is the address of the website the visitors came from. This address can be faked, and referrer logs are increasingly being filled with "visits" from sites with innocent-looking addresses - but they are actually porn or herbal medicine or other spammy sites. The spam might not be noticed unless they are in the top 10 or top 20 visitors of a site -- so they relentlessly visit a site in order to push their address to the top of the analysis chart. This is referrer spamming.
News and advice related to referrer spam and how to stop it.

Some websites collect data on visitors to their website. One bit of gathered data is the address of the website the visitors came from. This address can be faked, and referrer logs are increasingly being filled with "visits" from sites with innocent-looking addresses - but they are actually porn or herbal medicine or other spammy sites. The spam might not be noticed unless they are in the top 10 or top 20 visitors of a site -- so they relentlessly visit a site in order to push their address to the top of the analysis chart. This is referrer spamming.