Although user behavior in the popular Facebook social network site has been intensely investigated since the site came live in 2004, we know little about users’ emotions and values weaved in the fabric of their interactions. We report on a diary study for collecting daily accounts of users’ most memorable experiences. Outcomes emphasize the distinction between public and private presentation together with user motivation for engaging in each of these roles. Findings also suggest that at their heart, people’s most memorable experiences with Facebook are all about positive emotions, in particular those concerned with connectedness and entertainment.