facebook and youtube not working?

when using chrome firefox or IE facebook does not respond at all not even home page also youtube, youtube does come up with home page but any video you try and watch it just says video not working, this happens for all videos on you tube. type faceboook into chrome and it just comes up with Oops! Google Chrome could not connect to www.facebook.com. occasionally they both work as normal but very seldome. could it be anything to do with usage of internet or something? i have heard of a couple of other people in my area ( 'north west highlands of scotland') having the same trouble. thanks in advance for your answers