I saw someone already asked but I can’t remember the answer - is it OK to post new channels in #announcements ? In this case #react .
I think it is announce-worthy. But I'm not someone whose opinion can make it OK or not OK 😃 .
@orestis #announcements is intended for project announcements, not channels. People are creating channels all the time so it would get far too noisy.
I'm surprised there wasn't a #react channel already but if you really must "announce" it, there are various front end channels where it might make sense.
In general, folks create new channels, invite a bunch of relevant folks/friends in, and then they grow organically.