ColinTheMathmo is a user on mathstodon.xyz. You can follow them or interact with them if you have an account anywhere in the fediverse.
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I made a flow chart of which Mastodon posts end up in which timelines!
So, you can see how each instance will have a different local timeline, and even a slightly different federated timeline - and you can see why the federated timeline moves so much faster than the local one, too.
@cassolotl I think it was original toot that prompted me to make this:
