Today's teachers are faced with a number of options when it comes to sharing knowledge about their professions. In the digital age, teachers use social media, online professional networks, email listservs, and blogging connections to share knowledge and resources. Here, I describe how one teacher engages with social media to develop networks that are at once local and global, tied into their school settings, districts, and communities even as they extend far beyond these spaces. I engage multiple methods, including qualitative interviews and observations and quantitative social network analyses of Sylvia's Facebook network. Analysis of Sylvia's practices and digital networks reveals the degree to which teachers' physical and digital lives overlap and draws attention to a need for further research on teachers' digital lives.