When I first heard the term 'VoiceThread', I thought it related to a web community board that used voice comments instead of text. I have since learnt that VoiceThread has the implication that messages can be sent over the site in various ways such as voice, video and picture to get a view and topic across.
VoiceThread (2009) describes it as
A VoiceThread is a collaborative, multimedia slide show that holds images, documents, and videos and allows people to navigate pages and leave comments in 5 ways - using voice (with a mic or telephone), text, audio file, or video (via a webcam). Share a VoiceThread with friends, students, and colleagues for them to record comments too.
VoiceThread offers section specifically available to educational institutes, with focuses on K-12 and higher education. They offer a safe environment in which students can interact with each other, and only those invited into the group would be able to view and make comments on the threads (VoiceThread 2009). This would be of great benefits to educational institutes in providing interactive, web and ICT based assessment pieces for students to focus on.
VoiceThread 2009, 'VoiceThread', viewed 21 August 2009, http://voicethread.com/about/