The best thing about this little change? You can do it in front of the telly with your Christmas chocolate. Cut the people on Facebook who upset you, unfollow the Instagram accounts that don't make you feel fantastic, delete all your unread emails (if you didn't get to them last year, you're never going to), mute those annoying people on Twitter. Mute that hashtag that drives you crazy! While you're on a roll, delete any apps on your phone that you don't use, and give your computer desktop a bit of a tidy up.