You get those when you post pictures in the gallery (link at top of forum). If you have albums on your profile, those are accessible on your profile or if you link them.
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry