Real Time live Whiteboard

Hi, Project for a real time live whiteboard where cursors can be seen moving across the screen. Each visitor's cursor must appear on the screen (whiteboard) and other visitors can see it moving in real time. Users should be able to do 3 things : 1- Users can write a short profile about themselves (sex, location, interests) and upload a picture to use as an avatar. Access to this profile can be done by clicking on another user's cursor. Avatar picture must appear next to the cursor to identify user. 2- Users can chat by just clicking on another profile 3- Users can create pages about any topics and search, comment them; a search bar is necessary. Interface of the website should be strong enough to host as many moving cursors on the screen as possible. If an unlimited number is not doable, then a specified limited number of cursors to be seen moving on the screen should be set. (Between 10-20 cursors in real time is enough) Interface should be light, fast and require no software download for the user. You are free to choose any method to make it possible. Ideal profile for this is someone who has already conceived a whiteboard before.