THIS is slightly overdue. I mean, it would've helped a whole bunch during the election. But it looks like a step in the right direction.
Soon, if you're about to share a story that has been flagged for not being factual, you will get an alert. You can still post it (if you're a dick) but at least you'll know that it's heavily disputed and that you are a f**king idiot :D
Read more about it HERE