Just a question. Why are pictures allowed that are so large that they blow the screen? It is very distracting to have to scroll to even get an idea of what the picture is of, plus be able to read the text on the entire thread.
Example
That picture was taken with a phone camera, and if the poster were to shrink the picture by 70% and emailed it to his own computer, and then downloaded it to the forums, everyone would be happy, because the picture wouldn't be oversized. There are ways that the forum software can control this, however, it will cause the poster problems if his whole post is rejected because of an oversized picture. It takes a combination of software settings, and educating forum users to limitations of picture size. You might say that picture hosting is a double edged sword, to keep pictures a reasonable size, and keeping the forum users happy when it comes to picture size.
Even if the forum software were set to disallow these giant pictures today, those oversized pictures that were posted in the past will still be here, in all there giant glory.