My Take
Padlet (formerly Wall Wisher) takes the idea of a physical bulletin board and creates a simple, yet visually appealing, site with many possible applications. Boards can be set up for themes, question/response, or really anything that you can imagine on a bulletin board.
How I Use It
I have students in my online courses/tutorials link to Padlets I have created to activate background knowledge, sound off ("What bugs you about the way schools handle reading?"), or ask questions. I have them post by initials, but they could also post anonymously. I also use Padlet for professional growth with educators in much the same manner. In the next few weeks I want to try it as a log in for independent reading where students will post the title of their books and the page they are on.