What is twiddla and how can I use it at school?

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Twiddla.com is a homepage that equals a whiteboard at school. The user is able write down everything he/she wants on a white screen, either with handwriting (using the mouse) ot type in the letters. He/she can also include pictures, memos, speech bubles and symbols like thumbs up (to be seen on the example on the left). That is nothing special so far...
The big advantage of this homepage is that more than just one person can do all of this on the same screen at the same time! They just have to share the same link. Each of them sees in real time what the others do. All of them can add new things or erase content that is not needed anymore. There is also the possobility of voice chat. The users can communicate with microphones and talk with each other while using the homepage. This makes it very interesting for teachers, especially in English courses.
Students will probably love to create a product together and share the same screen. The included chat allowes them to write with other members and train their communicative and social skills as well as their creativity by working with the homepage. The easy access even allows the students to work together with other classes all over the world. Using their microphones, they can also train their speaking and listeneing skills. Teachers could arrange group works of students in different classes from different parts of the world. There are no limitations and the teacher is free to think of different ways to include this tool in his/her lessons.
For a monthly fee, students can also share images and have more possibilities using this homepage.