(1) (pinboard.in) A social bookmarking site developed by Maciej Ceglowski in 2009. In 2017, Pinboard acquired Delicious, another bookmarking site that was taken offline two years later pending changes. See
social bookmarking site.
(2) (pinboard.com) A weekly email newsletter sent to members of a group or school. Founded in 2011 in London, Pinboard was designed as an electronic equivalent of messages pinned to a cork board that hangs on a wall in the hallway of a school or community center. Users may sign up with an existing Pinboard or create a new one from scratch.