When using the Steam Community, I get the message “Your account has been blocked from participating in the Steam Community.” What does this mean?
This message indicates that you have been blocked from using the Steam Community due to inappropriate behavior. For more information and for the length of the restriction please login to your Steam account and click on the red Steam alert banner. The block may be related but is not limited to:
The use of graphic or otherwise inappropriate avatars, screenshots, artwork etc.
Spamming the community
Harassing other users
Continuing to post moderated content
Posting content related to racism or other forms of bigotry