This week **Music streaming royalties strike a bum note **The BBC screw turns again Media Moment of the Week Elon Musk is no stranger to social media spats. His indiscretions on Twitter have moved stock markets, led to a highly-publicised defamation suit and landed him a $20m fine. So there was some surprise when Tesla listed a job advert for someone whose responsibilities included defending the brash billionaire from social media trolls. Image: Twitter/@jaymboller Tesla hastily removed this sentence following the online ridicule, but the position is still up for grabs. Perhaps the social media duties will be an unofficial extra…