All fan sites are 'illegal' in that they're using copyrighted material without express written permission, etc. It's when a site starts to make a profit that the studio might take interest and take it down, or posts material that is offensive. Now, slash fic exists and has existed for decades. I thikn the studios just accept it as part of the business, unless of course, you slash cartoon characters. Warner Bros. doesn't care for fans to slash its characterson sites, so some sites have gone poof.Originally Posted by Spiderqueen
Fanfic is a very gray area; while the studios tolerate it, they could easily shut down any and all fan sites if they wanted to simply because they have more money and more legal standing.
All fanfic should have standard legal disclaimers about copyright etc., to protect your work as well. You may be using the characters of O'Neill and Sheppard, etc. but your writing belongs to you, as well as any original characters you create.