If you’re like most people, you probably use Facebook to keep in touch with friends and family. But what if you want to change the thumbnail of your Facebook video? There are a few ways to do this, but the easiest way is to use the Facebook app on your phone. Once you’ve logged in, open the app and select " Videos." Then, under " Thumbnails," select " Change thumbnail." Once you’ve made your changes, save your changes and then share your new thumbnail with your friends.