Take a look to the HTML source of GaiaOnline, here’s what you’ll find:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Welcome to Gaia | Gaia Online</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="en-us" /> <meta name="Description" content="Gaia Online is an online hangout, incorporating social networking, forums, gaming and a virtual world."/> <meta name="ROBOTS" content="NOODP"/> <!-- Are you the kind of person that looks at HTML source, trying to figure out if we're clueful or not? We're looking for a PHP or HTML/CSS/Javascript guru (or, miracles of miracles, both!) that wants to work with a growing company that is setting out to take over the world in a good way. Do you love figuring out how to do closures in PHP? Does talking about the challenges of dealing with 100k simultaneous users make you start sketching diagrams on nearby napkins? Does the prospect of working with a bunch of talented individuals that make bad jokes in IRC not scare you? If so, come talk to us! We could list years of experience, but if you're smart and good, does it matter how old you are? Send your resume to resumes@gaiaonline.com, and mention you saw the ad here! -->
Sounds like a nice proposal, uh ? 
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So for some reason, this post broke my rss feed reader. Looks like it doesn’t deal well with encoded xhtml.
Find their bugtracker and file a bug