What is the Retro app for and how do you use it?

Let's look at how to use the Retro app, whether it's free and whether it can compete with other social media apps.

Let&#39;s look at how to use the Retro app, whether it&#39;s free and whether it can compete with other social media apps.<p><img src="https://www.engadget.com/img/gallery/what-is-the-retro-app-for-and-how-do-you-use-it/intro-1786385235.jpg" /></p>