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There is no way to push content, that's why I am wondering if it's one of the tags? Can you see lots of tags by the way?
Is there anything above the post in your timeline indicating that someone boosted it?
Also it's worth clicking on the account of the post just to check if you've accidentally followed it (this can happen on some apps when people scroll quickly).
The transfer guide is at https://fedi.tips/transferring-your-mastodon-account-to-another-server 
Yes, and there are customised versions of Mastodon called Hometown Mastodon and Glitch Mastodon which include the option for "local" posts (posts that only people on your server see).
If you want to discover good reliable servers using these customised versions I've listed some at https://fedi.garden/tag/glitch-mastodon and https://fedi.garden/tag/hometown-mastodon
Main Mastodon has resisted this I think partly because of concerns that it might encourage centralisation and endanger the network.
Hello Dan, welcome! 
If you want help using this place, please do feel free to ask
There is also lots of help for new people on the website at https://fedi.tips (especially the section at the top marked "Quick Start").
There's no algorithm!
Home is all the posts from all the accounts you follow, all the posts shared by accounts you follow, and other people's posts that use hashtags you follow.
Local is all the public posts made by people on your server.
Federated is all the public posts made on your and other servers that your server has noticed.
More info about feeds at https://fedi.tips/what-are-the-local-federated-home-timelines-how-do-i-stop-them-scrolling-too-quickly/
Yup, that's it!
On that site clicking the address takes you to the account's page on its own server which may not be your server.
To follow an account from the directory, copy-paste the address into the search box on your server. The account will then appear on your own server and you'll be able to follow and interact with it.
Hi Jon, welcome!
I've done a list on all the ways to discover accounts to follow at https://fedi.tips/how-do-i-find-accounts-to-follow-on-mastodon-and-the-fediverse-how-do-i-find-my-friends
If you want even more tips for new people there are lots of them on the website at https://fedi.tips (especially the "Quick Start" guide at the top of the page).
Welcome Stev!
There is lots of help for new people on how to use this place at https://fedi.tips (especially the section at the top of the page marked "Quick Start").
If you have any specific questions feel free to ask, I'm trying to provide unofficial tech support here
Welcome Nox
Feel free to ask if you want help with using this place.
There is also lots of help for new people on the website at https://fedi.tips (especially the section at the top of the page marked "Quick Start").
That post has a LOT of tags on it, maybe too many as they don't all seem to be relevant.
Are you sure you're not following any of those tags? You can check by clicking each tag on the post and seeing if you have a follow or unfollow button for it.
That was attempted by various distributed networks, maybe most famously Scuttlebutt.
However, the current structure of the internet apparently made this very difficult and they still had to use multiuser instances called "pubs" so people could discover others to follow.
One of the most prominent Scuttlebutt projects was @manyver_se but it seems to be dormant now.
Hashtags on lists is one of the most requested features, so the developers definitely know people want it.
You can't reply to someone else's thread and tell them to buzz off, it makes no sense?
Um... you're the one replying to my thread?
Kind of weird to reply to someone and tell them to go away?
If it's not decentralised then there's no meaningful migration.
There are discussion threads on here, my reply to you is forming a thread?
Have I misunderstood what you mean?
I don't see what large servers have got to do with this?
I use the managed hosting service @mastohost
They do all the techy stuff so they would know the specs. I assume I'm on some kind of shared server with other instances.
You just need one account because your server talks to other servers too. For example you and I are having this conversation but we are on different servers
More info about this topic at https://fedi.tips/do-i-need-multiple-accounts-do-i-need-to-join-lots-of-servers/
Yes, Mastodon.nl is an instance (also known as a server).
Sharkey is a very different kind of platform, it's got a very different interface. I'd recommend beginners starting on Mastodon as it's a bit easier and currently better supported, as you can move to a Sharkey server later if you want to.