Medium: a sleek blog-publishing platform designed for optimizing interactions between author and readers with marginalia comments, which can be made private or public (the latter, with the approval of the author). Comments can be enabled in fully published mode or in draft mode (whose visibility is limited to individuals with the unlisted link). Great platform for collaborative authoring and/or annotating text. The blog also aggregates post by themes, rather than authors allowing users to find stories that are similar to their “favorites.” FREE.

See our post on How to Use Medium in the Classroom.