Mastodon is a free and open-source software that allows you to self-host your own social network on your Raspberry Pi. This software is a microblogging platform that is very much like Twitter However, unlike Twitter, it is possible to use Mastodon to run a private social network.
Please note that Mastodon is a relatively heavy piece of software. You will have the best experience using a Raspberry Pi 4 with at least 2GB of memory. Additionally, you must be using a 64-bit operating system due to the newer release of PostgreSQL we will be utilizing.