Me.dium: attention data
"The figure might seem staggering, considering Me.dium is merely a downloadable plug-in for FireFox. Once you install it, it tracks where you go on the web and lets you talk with other people who have also downloaded the plug-in — as long as they’re sitting on the same websites you land on (See the screenshot above. The orange figure is me, the yellow figure is a friend, and the solitary blue figures are sitting on sites that Me.dium recommends based on the one I’m visiting.)
Attention data, captured on your computer, can produce much richer results. Me.dium knows when you initiate a search and what you’re searching for. It learns your browsing patterns and connects you to people whose patterns look like yours. And it communicates this information to its server and to you in real time.
If Me.dium reaches critical mass, you could theoretically connect to anyone browsing, shopping, even searching for the same things you are.
To reach its goals, Me.dium is going to have to collect a lot of data. Google, with its Web History offering, is already collecting similar data. Me.dium simply ads an element of social browsing to make it fun."