WallWisher is a free online tool that allows users to create interactive bulletin boards called "walls" that can be embedded in websites or wikis. No account is needed to view walls, but an account is required to create one. Users can customize walls by setting preferences, adding images and titles, selecting themes, and making posts. Posts are called "stickies" and allow text, links, and attachments. Walls can be shared by copying the URL or embed code. The document provides examples of how walls could be used in elementary and secondary classrooms.