I don't think I'm using the right terminology because every search engine I try brings up unrelated results. If I can't work out the category or description for a particular kind of site, one trick I use is to go to a Web directory and find out how others categorise it. In this example there are several similar services listed - so this exercise has turned into a great starting point. Don't be caught out by what appears to be a subtle difference between search engines and directories.
Search engines use robots to trawl through page after page to find a key phrase or term.
Directories are like catalogues where human editors group noteworthy sites in an orderly fashion. It may be confusing at first, but Web guides often have their own search functions. I don't want to have to register a domain name or anything. Just as there are forwarding services for Web sites, there are similar services for e-mail. Services like Forever Mail offer addresses that reflect your hobbies and interests.