This particular entry addresses twitter, but there are many great things on this blog. How cool that a husband and wife blog together (can't imagine that happening at my house!) They include various resources, including history and elementary ed.
you can use these for your students to contact authors (or their people). It was suggested that students tweet their reviews of the authors' books to them.
Welcome to the TESiboard collection,a purpose built library of visual, dynamic,interactive resources.TESiboard resources are primarily openendedtools that enable teachers to enagagetheir pupils in a learning dialoguearound the resource.The resources are designed for use by theteacher on their interactive whiteboardbut many are also suitable for pupil use,usually responding to a task or challengeset by the teacher.The TESiboard materials were acquiredby TSL Education Limited at the end ofNovember 2009 and as a result of TSL'scurrent and planned future investment,all these popular resources are availablefor free.
This site is from the UK. You can also follow them on twitter, @TESconnect