Efficient communication is a MUST

Why do people keep posting the same message again and again in various community groups in Grapevine. Recently, I opened the app and I could see the same message posted by an individual, in “Hiring”, “layoffs”, and many more. And this has been happening for a while now, and it just doesn’t make any sense. Communities are created so that you convey your message precisely, and best part about grapevine is, the most recent ones will show on the feed, so why the desperate act of posting it everywhere??