Getting messages from random people you don’t know is the worst. Facebook wants to help clear things up by providing details on messages from strangers.
It’s not just for complete strangers either — the information might show up for Facebook friends you haven’t spoken to online before. The feature won’t help you if the person doesn’t have any information set to “public” however.
The update is rolling out for iOS and Android today in the US, UK, France and India. We’ve contacted Facebook for more information and will update if we hear back.