This has gotten way off topic from a question about signatures to linking to other sites however, I will add this concerning other sites though since ithe thread has gone in that direction. Aploogies to you truckasaurus123.
Simply putting a link to another site in your signature is not in itself helping someone answer a question. They would have to go there, create an ID, post a question and wait for an answer. Something they could simply do here without going through the hassle of joining somewhere else. Links placed in post directing someone to the answer to their question have in a lot of cases have been allowed, especially in certain sections.
Our marine section, while quite active, is still developing and in the past, Great Lakes, Steelhealr and other mods in that section have been lenient and allowed links to other forums because the amount of information on this site was still small compared to the vast marine aquatic hobby. Some questions couldn't be answered with a simple search of the forum. On the other hand, in the FW sections, the answers to almost all questions can be found with a simple search of the forum.
The key that we try to use in whether to allow a link is whether the article or thread linked is pertinent to the topic AND is it information that can't be found elsewhere. In most cases, the first one is true but usually, the second isn't. And a link in a signature fails on both accounts.