Real-world social networks exert an enormous influence over our attitudes about marriage. This is one reason that Facebook makes some people so unhappy. Watching the parade of our friends’ major life events makes us both envious and lonely.

Given that envy and loneliness are Valentine’s Day’s two chief exports, TIME presents an app that analyzes your Facebook feed to see exactly when your friends are tying the knot—and when it might be time for you to take the plunge.