... Findings from several ecological sampling studies indicate that multiple types of IER-such as social sharing, humor, and physical touch-are routinely employed in daily life, can exert a powerful emotion regulatory influence, and are linked to the quality of close relationships (Debrot et al., 2013;Heiy & Cheavens, 2014;Horn et al., 2018;Niven et al., 2009). Moreover, a wide array of individual differences in interpersonal emotion regulation tendencies, such as tendencies to coruminate with close others, have been found to be cross-sectionally or longitudinally associated with psychological well-being and mental health (Cheung et al., 2015;Dixon-Gordon et al., 2018;Dixon-Gordon et al., 2016;Hofmann et al., 2016;Horn & Maercker, 2016;Rose et al., 2007;Spendelow et al., 2017;Stone et al., 2011) and with interpersonal and social functioning (Debrot et al., 2013;Horn et al., 2018;Niven et al., 2015;Niven, Macdonald, & Holman, 2012;Rose, 2002;Rose et al., 2007;Williams et al., 2018). For example, in one of the most thorough investigations of IER and interpersonal behavior available, people who perceived IER to be more efficacious and who reported seeking IER more frequently reported feeling more socially connected; reported greater use of interpersonal coping strategies, including emotional support, venting, and instrumental support; were more likely to choose to view emotionally evocative images with another person (vs. ...