I've come across a couple of avatars that advertised other websites, as per our guidelines this is not allowed:
2. No solicitations or advertisements are allowed. This includes advertisements for your business or latest get-rich-quick scheme. Such notes add clutter to the boards, and will be removed. You may not suggest or encourage illegal activity. Any posts will be removed and will be made available to the authorities.
Since we look forward to each and every post, we encourage you to change your avatars or select a new picture from your profile area :)