Apparently made by a TF2 concept artist called Moby Francke. It’s probably a scrapped concept, as it doesn’t look like his head would actually fit inside his mask.

The latest update addressed the steam community, changing each member’s profile pages. Haven’t loaded up your profile yet to see what’s new? Alright, I won’t dodge the issue, you can now post and receive comments on steam member pages. Who can post where is up to whoever owns the respective member page. This works for group pages as well.

In short you can set permissions to allow or deny groups of people to post comments on your profile or on group pages that you own.

How this will work out, we’ll see. There doesn’t seem to be any anti-spam method if you’ve got your profile comment permissions set to public, but you can delete them just fine.