It's an interesting subject and a weird tightrope to wapk.
For example there have been times I've been told things that I've been able to post but can't reveal the source. For sure it annoys people but at the same time those same people want to know
To be honest I just find it easier to not say anything these days in those cases.
With VH I have a policy to always have evidence to back things up (almost always an image or article) before I post them for this exact reason. Just makes things easier.
There is another issues. I was told about a major coaster at a big park that was in planning years in advance with images of plans and all (in this case it wasn't shareable) But things changed and another coaster was built instead (something that happens surprisingly often). That happens after you post something and you look like an idiot.