Organizational leaders are increasingly expected to be visible and communicative on social media with organizations' public. Drawing theory and literature from dialogic communication and leadership communication, this study analyzed and compared how corporate and nonprofit executive leaders capitalized on various dialogic principles and social presence strategies for engagement purposes. We content-analyzed Twitter posts from leaders in corporate and nonprofit sectors.Findings revealed notable differences in how corporate and nonprofit executives communicated with publics on Twitter. While leaders from both sectors posted information valuable to their stakeholders and used affective strategies to project a personable image and nurture relationships, nonprofit leaders focused on social influence, whereas corporate executives emphasized information dissemination. This study also showed mixed findings regarding the relationships between leaders' communication strategies and publics' social media engagement.