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For the guy or girl pining after their crush, or perhaps someone who wants to become a shoulder to cry on in the hope of converting that into a a rebound roll in the hay, the Breakup Notifier is a tool of choice.
You visit the site, and log in to Facebook. After choosing the friends you want to recieve relationship notifications for, you will get an email every time a change is submitted.
The app checks these statuses every ten minutes, so you can be quick off the mark to anything you'd like to twist to your advantage.
Image credit: Breakup Notifier