Glogster - http://edu.glogster.com/glogpedia
 
Glogster is a creative center for teachers to design and develope interactive posting area. There is a variety of colaboration and sharing taking place through designs of posters and tack boards where individule can add to the conversation at any time anywhere. Students can gather information regarding subjects and teachers can network to gain an undrstanding of consepts from otheres a=from all over the world. With the aid of visual adn imbeding audio, you can target all types of learners from visual to audio a long with group interactive work. 
As for useage the disclaimer is as follows:
http://EDU.GLOGSTER.COM DOES NOT REQUIRE CONTACT INFORMATION TO BE OBTAINED BY A CHILD IN ORDER TO PARTICIPATE IN THE SITE, THEREFORE, IT IS UP TO THE TEACHER OR PARENT UTILIZING OUR VIRTUAL CLASSROOM PRODUCTS, TO OBEY THE TERMS OF THIS AGREEMENT AND ANY AND ALL LAWS PERTAINING TO CONFIDENTIALITY OF INFORMATION FROM CHILDREN UNDER THE AGE OF 13.