Once you've found out a friend has been engaged, the first thing you want to ask them is, "Can I see the ring?" But is that being presumptuous? And if you're the one who said yes to a proposal, how do you approach those inevitable inquiries on Facebook? Is it OK to put photos up online? And then there's always the issue of what you should do if the engagement is called off. I have these and more ring etiquette scenarios that you may face as either a bride-to-be or an acquaintance of one, and I want to know if you think they are tacky or tasteful.