Stephen Downes

The idea here is that when you visit a web page, your cursor is visible to other people as they visit the same web page. More, you can type short temporary messages that follow your cursor around and can again be seen by other visitors who are on the page at the same time. Also, if you highlight text, other people see the highlight for a short time. And yes, there's a 'silent mode' of you want to opt out. Via Taylor Jadin.