This sequential, mixed methods research addressed emerging social media use practices among IT professionals and explored lived experiences of senior IT leaders relative to successful organizational social media adoption and use. The study was informed by structuration theory and elements from the universal technology adoption and use (UTAUT) model, generation theory, and open leadership theory. In the first, quantitative descriptive research phase, an online survey was administered to describe IT professionals' uses of and attitudes toward social media in the workplace. Survey results based on 406 responses from IT professionals in the greater Seattle area indicated widespread use of different social media applications, and also showed that Millennial IT professionals use social media more extensively and are have more positive opinions about social media as compared to their older colleagues. Survey findings also indicated that an increasing number of employers are developing formal social media strategies and adopting policies and guidelines governing the use of social media in the workplace. The second, qualitative hermeneutic phenomenological research phase built on survey results and involved interviews with 13 senior IT leaders in the greater Seattle area. Findings indicated that despite the inherent user-driven nature of social media, senior leadership plays a key role in driving strategic social media adoption and in ensuring broad participation across generational cohorts and employee groups. Findings from the qualitative research phase further suggested that social media can help employees and stakeholders communicate and collaborate more effectively and efficiently, and that leaders can derive significant benefits from social media without compromising the integrity of their organizations. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]