For example, a world-famous sportsman will be able to publish a post and include in the description that the top 3 active donators on the post will get the opportunity to meet him (for dinner, at a training club, etc.). With millions of followers and a lot of fans out there that love him, there will be a lot of people striving to win the prize and the whole thing is likely to be covered in the media. The winners will be known by everyone and will get their moment of glory. The celebrity, in turn, will be able to donate these proceeds to charity.