filkerdave is a user on octodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
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For those interested, I'm moving my #HamRadio tooting to (at)K2FI(at)radiosocial.org
(Done that way because apparently mastadon doesn't like the double @ )
@filkerdave It took the double @ and made it a link to the target account. I clicked and followed.