Thanks to Miriam Perez and Caroline Page, I successfully used Linoit to brainstorm goods and services for Social Studies.  Afterwards, I was inspired to find out more about QR code activities.  I found this great set of QR code equations to help my students choose appropriate addition strategies.  I also found a website to create a QR code treasure hunt-I have created some codes, but am still working on the idea of using them in a more novel way.  Here is the link:  http://www.classtools.net/QR/