I used Twitter to sell an ebook for one of my clients then, and it was a success.
If you have huge followers, that's great. The ease of running ads is the number one step on Facebook and Instagram. Without this ads, there's no way you can find as larger audience than you expected.Facebook and Instagram have been my favourite social media platforms to use in making sales online. They made it possible and easier to use their marketplace to sell and you can run ads on them to get more reach.