For showing the Steam GamerCard, users must do the following:
Login to steamcommunity.com -> Edit my Profile -> Copy the text from the "Custom URL" box into the Steam ID field.
If you don't do this, your profile link will not work.
This is if someone wants to put a link to their profile in their postbit. See the xbox thing under my name? That links to my profile. A lot of people here play games with each other.
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