By | February 23 2011 6:37 PM

When programmer Dan Leowenherz released Breakup Notifier earlier this week, he didn't expect the unassuming Facebook app to garner the attention that it did. Within twenty four hours, the app, which emails users when their crushes become single, had had 100,000 users -- an unequivocal success for a program that took four hours to put together.