Sites that do not have their own content, but only redirect to other sites, are considered the category of sites to which they redirect.
Sites that embed other sites into their content, for example, using frames, are equated to the category of embedded sites
Sites containing multiple links to sites of the same category are equated to the category of sites to which they link (except for search engines and directories).
Dating websites. The main criterion of the site for getting into this category is the base of users who want to get acquainted, with the ability to search for it and the ability to add themselves to it.
The urls contained in the body of viruses.
Attention: often in the body of viruses there are quite normal sites, once hacked sites or sites that allow you to save a file containing a virus, for example, a fake image. It is not recommended to block such sites. This category is only for detecting viral activity.