answer:I don’t think there’s any way to prevent a post to an open group from showing up in the ticker. In fact, I’m not sure that even a post to a secret group would be left out of the ticker, although your friends wouldn’t be able to go to the post itself to read it. But that would be my only advice for trying to prevent it – to change it from an open group to a secret group. I get that it’s not what you’re after, though.