You can build an Amazon affiliate store on Facebook by creating a Facebook Page. You need to choose a niche for your store. You should regularly post engaging content about products. You can share Amazon affiliate links in your posts. You must disclose that the links are affiliate links. You can create product recommendation posts to attract followers. You should join Facebook groups related to your niche. You can promote your store through Facebook Ads to reach more people. You can use Facebook Shop to display products directly. Consistent posting and engagement will help you grow your store on Facebook.