The #FreeBritney hashtag has been used hundreds of millions of times on social media. You may have seen it in your own feed. We break down five reasons why the singer's conservatorship remains controversial and in the public eye, plus why the campaign continues to be of interest to so many. BBC My World is a show for young people around the world, brought to you by executive producers Angelina Jolie and the BBC World Service to show you how the news is made, fact-check stories and spot fake news.