It’s never been easier to miss a great math blog post. The MathTwitterBlogoSphere –– known as #MTBoS around social media –– was once a small group of math teachers willing to make themselves vulnerable, putting their practice online. As the community has expanded, even the most dedicated readers struggle to keep up with the deluge of thoughtful commentary, engaging and interesting tasks, and stories that we can all learn from.

In this book, we have compiled some favorite posts from this past year, as nominated by MTBoS folks on Twitter. These posts are as rich and varied as the educators who wrote them. Some delve into specific content. Some tell stories of change and growth. Others explore teaching practices, new or well established. We hope that you find some that provoke and push you, and others that make you smile. Most of all, we hope you make some new connections in the MTBoS community.

This book has another purpose as well. Since 2012, folks from the MTBoS have participated in an annual “tweet up,” a two-day math extravaganza called Twitter Math Camp (TMC). TMC is teachers teaching teachers. Sessions range from learning new content, classroom routines, or technology to sharing stories about students or what it means to change schools. Unlike regular conferences, teachers come knowing who they want to meet and what they want to learn. They are coming to continue a conversation that has been taking place online, through blogs and twitter. It is a rich learning environment.The grassroots nature of TMC means it is lively, personal, tailor-made, and unpredictable.

However, most teachers have to pay their own way. We will use the money raised through sales of this book to start a fund to bring along some of the teachers who would not otherwise be able to participate in TMC. We think that TMC is a unique professional learning experience, and we hope to share it while we grow our community.

Thank you for reading, and thank you for your support.

— Lani Horn & Tina Cardone