This study described the subjective opinions of teachers about their experiences at Edcamp, an unconference-style form of teacher professional development (PD). Traditional PD has been maligned for being overly expensive and ineffectual in affecting changes in teacher practice. In order to defend teachers' decisions to partake in Edcamp-style PD, it was necessary to identify their views about their experiences. Q methodology was used to determine the teachers' perspectives. A review of relevant literature in teacher PD, professional learning communities, communities of practice, and social media was undertaken, as well as a demographic survey of Edcamp participants, to better understand the phenomenon of Edcamp. The result of the literature review and demographic survey was a 36-statement that was sorted by 19 teachers. A three-factor solution was the result of analysis using PQMethod software. Themes for the factors were developed using interviews from exemplar sorters in each factor as well as Twitter data from the day of the Edcamp event. The three factors were interpreted as Tweeting Edcampers, who highly valued the opportunity for social learning and sharing via Twitter at Edcamp, One-Time Edcampers, who preferred traditional PD and did not find Edcamp PD to be considerably helpful, and Edcamp Converts, who found Edcamp PD to be transformative and relevant to the contexts of their classrooms. All participants indicated a strong preference for continual, meaningful PD. Significant findings included the importance of giving teachers choices in PD vectors, teachers' preferences for participating in informal learning opportunities, and the considerable meaning teachers attribute to the social media application Twitter for learning and sharing. Future research should study administrators' opinions of Edcamp-style PD and its relevance to their teachers. Future research should also study the long-term effects of Edcamp-style PD and Twitter use on teachers' professional practices. [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.]