The existing system for validating user information was written to be easy to extend. Several validators have been added to it already but there was another one I wanted to add.
Several users sell Steam games and game items so it felt natural to give users the possibility to validate their Steam accounts on SuchList.com.
It is done as with most validators.
You validated information is clearly visible on your profile and users will be able to easily access your public steam profile to learn more about you and to make sure you are who you claim to be.