I don't see the Mastodon thing for it yet. Has it been made?
Edit: I'm using uwu.social, so maybe that's been de-federated?
Welcome to the new Fediverse Writing Month Community. This community is for the continuation of NaNoWriMo in spirit, without any connection or relationship with the original organization / organizers.
(Coming Soon)
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I don't see the Mastodon thing for it yet. Has it been made?
Edit: I'm using uwu.social, so maybe that's been de-federated?
Do you mean the hashtag, or the account to follow?
I checked from Mastodon.social and was able to see the post under the hashtag, and when I searched for the profile I got:

I did a stupid. I added the @, and that caused it. Whoops.
It's confusing...I've had some platforms where I've had to use the @xxx@xxx format, and others don't.
FWIW - I've followed your uwu.social account from my mastodon.social and gotosocial.social accounts.
That's the one I use. I'll see if I can do it with my Misskey instance.
Edit: That's not possible. That instance was de-federated (that's alright, though).
Seems like a lot of Misskey instances got defederated for some silly reasons that I won't go into...but at least uwu isn't defederated.
uwu is a Mastodon instance that doesn't have many issues with some others.