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It also means "talk"

FWIW, "talk" is what came to my mind.

But it's social media though, so the other yakking will be involved...

I've only ever seen that spelled as "yak", so it took me a while to make that connection.

I thought "yak" was the bison animal. And that's what I thought of when I saw the name of this app -- not vomiting.

That's "yak"

My immediate thought too. It's definitely got that meaning in Australia.

Made me think of YikYak (r.i.p.)