A few days ago, my fiancee and her mom were talking about setting up a nice guy with my fiancee's sister. Unfortunately, said guy is in a relationship. My mother-in-law to be suggested it would be nice to know when the relationship was over (jokingly). I blurted out that I could make something that could do that in a couple of hours. By then, I knew I had to do it.
The application was built on Google Appengine, Django, and the Facebook Graph API. I'm checking for status changes every 24 hours, and am using the Appengine mail service to send emails whenever I notice that a relationship status has changed.
Seriously, this is mostly a joke. But enjoy, if you do choose to use it for real.