Yankdownunder is a user on mastodon.technology. You can follow them or interact with them if you have an account anywhere in the fediverse.
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I'm not sure I yet understand the difference between "local" and "federated" timelines.
@Stonekettle from the official faq "It's complicated, but short version is: “toots from people that you and other locals follow.”" instances can only show up in the federated timeline if the two instances allow federation with each other. Not all instances are federated
