A change in someone's "relationship" status

What happens when someone changes a piece of their relationsip status, so that everyone in their Facebook ne it? Eg., if someone married became single, or if someone single is no longer. What do you do? Particularly in the case of the former married. Do you wait for them to say something to you? Or do you send a message “I see your relationship status has changed”.
==Etiquette==
Depends on if it's a happy status change or not. Plenty of people break up or get divorced and update their statuses without realizing this change will be updated to all their friend's newsfeeds. For some, the last thing they need is to be reminded of it. For others, finalizing a divorce might be a joyous occasion that needs public congratulations or celebrations. It all depends on how well you know the person and the situation. If you don't know the person well enough to call them on the phone to ask about a status change, then don't bother messaging them either, it's none of your business.
Category:Facebook Etiquette