It's amusing that the top 3 trending reports are the FB sites that are down, and then the mobile carriers themselves, presumably because when FB doesn't load they assume it's their mobile network's fault. People really do think FB is the internet
It is a really large part of it. Also, when people see WhatsApp and see no connection, then open Facebook and see no connection either, it's _very_ likely that the link is at fault and not Facebook.