Amanda L. Forest, University of Pittsburgh and Kori Krueger, University of Pittsburgh As you scroll through your Facebook news feed, you see it: Your friend has posted a new profile picture. But instead of a picture of just your friend, it’s a couple photo – a picture of your friend and their romantic partner. “Why would someone choose that as their profile picture?” you wonder. We are social psychology researchers interested in understanding people’s behavior in close relationships and on social media. Our research and that of other scholars provides insight into why people use these types of “I’m part of a couple!” displays on social media. Choosing profile photos that include their romantic partner, posting their relationship status and mentioning their partner in their updates can all be signs of how people feel in their relationship – and may send an important message to potential rivals.