Excerpt from the user agreement:
"Only established members (at least 50 posts) are allowed to post and and share other sites, whether in a post, link, signature, profile, or private message. When you have 50 posts, you will be welcome to share your site (or someone else's) and/or add it to your signature, profile, etc. We do this to prevent people from joining simply to drive traffic to their site. Personal sites must follow the Advertising Guidelines listed below..."
http://eat.at/swap/useragreement.php
"Only established members (at least 50 posts) are allowed to post and and share other sites, whether in a post, link, signature, profile, or private message. When you have 50 posts, you will be welcome to share your site (or someone else's) and/or add it to your signature, profile, etc. We do this to prevent people from joining simply to drive traffic to their site. Personal sites must follow the Advertising Guidelines listed below..."
http://eat.at/swap/useragreement.php