There are a few things you need to do in order to start a challenge on Facebook. First, create a new challenge. This can be anything from writing a story to taking on a project. Next, make sure that your challenge is relevant to your audience. For example, if you’re challenging someone to do something difficult, make sure that the challenge is also relevant to them. Finally, make sure that you have enough information about your challenge and your opponent so that people can follow along and help you achieve your goal.