Following point must know to stop the forum spam

1. List 100 Web sites in your signature file.
2. Exclusively post only when you can add links to your sites in the post area.
3. Post nothing but “me too” posts to build your post count. Use in combination with a link-rich signature file.

4. Ask questions about who provides the best [WIDGET], where [WIDGET] is an item that you sell. From the same IP address create another forum account and answer your own question raving about how great your own site is.
5. As a new member to various forums, ask the same question at 20 different forums on the same day.
6. Post on forum threads that are years outdated exclusively to link to your semi-related website.
7. Sign up for profiles on forums you never intend on commenting on.