Due to an ever increasing amount of signature spam, we've decided to take the suggestions of our members to minimize it. Based on the idea of our very own swmeek, we've decided to restrict the ability to post URLs, and Images in signatures of members who are less than seven days old and have less than 25 posts.
After the initial seven day probation period and twenty five quality posts, the server will automatically remove the restriction of using links and images. Of course, there is always admin override as well and we're happy to override. Please feel free to send a PM