"On the internet, data lives forever. Many people have had to learn this lesson the hard way, unfortunately, after discovering that the "delete" button doesn't really work to delete something from the internet as a whole. The embarrassing missive lives on and on, in the web service's archives, in Google's cache, and eventually in the Internet Archive itself. That may be about to change, though, thanks to a new tool created by researchers at the University of Washington. Called "Vanish," the system places a time limit on any message posted to any web service through a web browser..." - Onur Kabadayi