Facebook has collected data on breakups from its users' posts and interactions. The data shows that Sundays around 7pm and Saturdays around 9pm are peak times for breakups to occur, likely because couples spend time together on weekends but have work or school to distract them early in the week. Breakups that occur in spring and summer are also more common than in fall and winter, according to Facebook's analysis of users' posts about relationships status changes and breakups.

1. Breakups DataFacebookSourceCNN.com; Facebook data

2. Facebook data on breakups