Facebook is not opening on any pc browsers nor on mobile...

Hello Friends,



its been few hours that i'm trying to open my facebook account from any pc browsers but its not opening and show the same result that this (page is not available)
although i tried to open my facebook account from my mobile phone but its also not loading then i thought i have internet connection problem and i certainly tried other websites like youtube etc and they were working quite well...so now i'm waiting for you'r suggestions. how do i fix this... :(