My Understanding Of the Term "PAGE NOT FOUND" and others similar

SO you wanna go  onto Facebook or twitter or whatever and you type in your user name thingy and password and you click enter, then you wait, and you wait, and then you do some more waiting, after something like 10min of waiting, your browser stops loading the page (you logging in) and give you the dumbest message I've ever seen, "PAGE NOT FOUND". So mister internet, are ya trying to tell me that even tho every 10 seconds someone logs on to Facebook you can't seem to find one of the most abused pages in the world, i know that not a lot of people on to my account (obviously) but you have to keep those "pages" in an area you can reach quick, like really, c'mon. So any way i just wanted an answer from anyone to why the hell the internet sucks so much at finding things that are constantly used

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