This is a site I had heard before but hadn´t tried yet, you need to have an invite though. You can record 12-second videos with your webcam or mobile, then post it or have it sent directly to twitter. So, instead of having written updates you can also use video.As you might have imagined 12 seconds is a very short time so you have to be very objective in what you say or show (just like in twitter). Just below is my first trial.
How can we use this tool with students?
Well, the best post I´ve read about this was written by Nik Peachey and my suggestion is that you go straight to his post to read all the great suggestion he´s given to teachers. Really worth reading.
testing 12seconds on 12seconds.tv