One of the best places to post a story is Instagram. It has a large user base and various features like Instagram Stories which are very popular. You can reach a wide audience, especially the younger demographic. Also, the visual nature of Instagram makes stories more engaging with options to add photos, videos, stickers, and text.
Facebook is also a great place to post a story. Many people of different age groups use it. You can share your story with your friends, family, and followers. It allows you to include photos, videos, and text, and has a 'Stories' feature similar to Instagram. Plus, if you have a business page, it can be a good way to connect with your customers.