It's not "polite" to post URL's from other people's sites as that's "bandwidth stealing". Some people have to pay for space to store their graphics and when you post it here, we get to see it but it does nothing for the person whose photo it actually is except cost them money, sometimes "extra" money as everytime it's looked at/referred to, no matter from where, a little cash register at their server :-) where they store it charges them for that use.

http://www.tipz.net/Bandwidth.htm

Many sites where one might have a free account and upload pictures won't show the picture anywhere except on that site, it can't be shown elsewhere, because of that.