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The core focus of Pinterest is to share content and ideas. Not to be confused with a content aggregator, the bookmarking facility can be used to exchange and resources pertaining to particular subjects.
In order to share content and ideas, not only can it be used to pin resources or themed content for lessons, but there are several examples of classrooms using the site to create their own class pinboards -- hosting events and images personal to each student. Businesses are also slowly beginning to see the value of these visual boards -- and I predict product placement and marketing will surge in the next few years.