Like other platforms, if you want to be able to socialize on the Fediverse with your friends and family, then they will need to be convinced to join! (I was lucky (strategic) enough to spin up a Mastodon instance and invite my family to join just as Google+ went dark. (Yeah, yeah, we were still using it)).

As far as "real" public content goes, my only real interests there currently are the news feeds for various open source projects/contributors and I can say that there are tons of those on the Fediverse!

- darktable: https://mastodon.social/@darktable

- ubports: https://framapiaf.org/@ubports

- Elementary OS: https://mastodon.social/@elementary

- Endeavour OS: https://mastodon.social/@EndeavourOS

- Blender: https://mastodon.social/@Blender

- Krita: https://mastodon.art/@Krita

- K9 Mail: https://fosstodon.org/@k9mail

- 0 A.D.: https://mastodon.social/@play0ad

- Kodi: https://mastodon.cloud/@Kodi

- ProtonMail: https://mastodon.social/@protonmail

- Fdroid: https://mastodon.technology/@fdroidorg

- Matrix: https://mastodon.matrix.org/@matrix

- NextCloud: https://mastodon.xyz/@nextcloud

And last but not least, sometimes you find random cool stuff to check out like the banjo music from the Capharnaum Counter Magicians Society (https://banjo.town/@magicians)