now raised more than $41.8 million (??24.6m) for charity.The social media craze has been completed by stars including Lady Gaga, Justin Bieber, David Beckham and former US President George W Bush over the last two weeks.In the UK, some celebrities have used the Ice Bucket Challenge to fundraise for MacMillan Cancer Support, as well as the ALS's British counterpart, the MND Association. 15 greatest