'I'm not saying the internet made me kill, but it certainly helped.' Is there someone online who really grates on you? That friend who's always bragging about their awesome life and endlessly sharing tired memes, and who just doesn't get jokes? Look at your Twitter feed: don't you get cross at the endless rage, the thoughtless bigotry and the pleading for celebrity retweets? Meet Dave, a street fundraiser and fan of cat pictures. He's...