Educators increasingly use social media for informal professional learning. A study examined why educators participate in online professional networks and how their participation differs based on role, experience, and age. Key findings include: Educators are motivated by community, convenience, and improving practice. Younger classroom teachers found traditional PD less helpful than administrators. Participation decreased with age while value of PD increased. Recommendations support validating informal learning, differentiated self-directed PD, and encouraging PLNs to reduce isolation and increase integration.