Why Facebook is not Loading?
If unknowingly the internet explorer was restricted from loading Face book site, then also you will not be able to load Face book. This might have been done by someone casually without your knowledge to the browser on your computer. The Firefox versions below 3.0.0 will not support many of the big applications on the net. I have the Firefox version of 3.6.8 in my computer. I generally do not face the problem with Face book loading in my system. But when I am working on several tabs in the Firefox browser keeping about 10 to 15 tabs, then the sixteenth tab will not support Face book. There were situations of Firefox crashing when I tried to access Gmail. Therefore the capacity to handle the sites beyond a certain limit is also probably necessary to take care in order to know why Face book is not loading.
Another reason for Face book not getting loaded might be due to some corporate sectors blocking the social networking sites in their internal working environment. Sometimes it may happen that by mistake pop-up blockers are on and you may face problem in loading some sites. If the pop-up blocker is off then the problem might get ended. I think the main problem is with network traffic.