This report explores the first iteration of a teacher professional development Courselet grounded in constructionist theory and activities. A design-based research approach guided this continuing examination of online teacher professional development (oTPD) activities within an educator social networking site. The topic of the oTPD was "Robotics and Hands-on Learning in the Classroom" for teachers interested in integrating constructionist LEGO robotics-based pedagogies. The Courselet engaged teachers in just-in-time, ongoing TPD utilizing Web 2.0 tools. Key findings of the first delivery of the oTPD Courselet point to flexible access, sharing of resources, teacher discussions, and support for constructionist pedagogical activities as the PD value for participants. Findings support the potential for an ongoing online community of practice around classroom robotics. The approach taken in this oTPD Courselet continues to inform a model of oTPD delivery within a social networking enabled environment. Further research is needed to determine the transfer of oTPD to classroom practice.