I had a problem with broadband so used my phone to lookup if it was just my area and found this site:http://downdetector.co.uk/
It shows service status for common Websites, services and apps like
BT, Sky, Virgin, EE, Three, Netlfix, Youtube, iplayer, ebay, facebook etc...
I'm sure there are other websites that do similar but it's nice to see in real time what's going on and you can report if you have a problem. Handy for fault finding when you are trying to work out if its at your end or theirs.