How can a site post public messages (timeline/wall posts) on other Pages it does not own via the Facebook API?

Question

I'm looking to create a site where whenever an event is triggered (e.g. user submits something), it automatically posts publicly on the wall of a Facebook page that it does not own (e.g. a company's FB page to alert their Community Managers).

I see a lot of solutions for posting via the FB API on a wall you own, but I can't find a solution that explains how to post a public message on a Page you do not own.

Is this even possible? If so, then how can this be done? If not, then how else can you alert other FB Pages (e.g. companies) of posts directed at them to call their attention?

Answer 1

You can only post to a Page you own, with a Page Token and the publish_pages permission. You can´t post on a Page you don´t own. It would be spam anyway imho. If that would be possible, it would be possible for spammers to pretty much spam every single Page they could find.