Mastodon is built differently. Just like the birdsite, you won't see every toot in existence but the 'why' is different. On birdsite, an decided. Here, it's your connections that truly, organically determine what you see.

It works because it gives you control over who you interact with, and the people you interact with shape the timelines of you and all your neighbors.

IMAGE CREDIT: axbom.com/mastodon-tips/

The visibility of a toot flowchart

In what timeline will a toot appear? 

For a public toot by user @hello ...

Are you following @hello? If yes then toot shows in your Home timeline. If no...

Is @hello on your instance? If yes then toot shows in your Local timeline. If no... 

Does someone on your instance follow @hello? If yes then toot shows in your Federated timeline. If no...

Did someone on your instance boost @hello’s toot, or search its URL? If yes then toot shows in your Federated timeline. If no then Toot never reaches your instance.
0
0
0

If you have a fediverse account, you can quote this note from your own instance. Search https://urusai.social/users/neatchee/statuses/109349453206032821 on your instance and quote it. (Note that quoting is not supported in Mastodon.)