Originally Posted by Sean_W
It's clearly not jpg compression. It looks like those screenshots have been taken from a video.
Click on pic, properties: http://i.imgur.com/KCNVX.jpg
The jpg part is because its a jpg. Its a 1.1 megapixel pic compressed down to 110kb. Assuming 24 bit color, thats 30 to 1. Bad. Not only that, but it also appears to have been zoomed in and/or cropped for some reason.