If you self host and other activitypub instances such as inside the same private network and use a split DNS, know that mastodon will automatically reject remote hosts if they resolve to a private IP address. Therefore you need your internal DNS records to point to your external public IP, or else you won't be able to cross-follow between your different platforms/instances. I'm going to go glue my hair back on now...

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Balsillie family social hub.