The site Me.dium.com ,i quoted below for your information.

Me.dium reveals the hidden world of people and activity behind your browser. For the first time, you see your friends and others as they surf around you on the web.

You may have downloading a widget on your browser ( IE7 or Firefox).

So first, a couple of tips:
1. The Map at the top shows people who have surfed the same pages as you, and the web pages they're on right now.
Go ahead and click on a web page icon in the map.
You'll see yourself move across the map to the new web page. Click back on your browser to come back to this page.
2. The Talk tab is your way of shouting out to Me.dium users who have surfed similar web pages.
* Your shoutout does not go to everyone. For example, it would go to the Me.dium users who were recently on the page you're chatting from.
* When you chat, the url of the page you're on is included in your chat stream. So people know where you're chatting from.Have a look in the Talk tab now.
Click Reply to join any conversation.

3. Finally, your friends tab is where you can surf with your friends.

You can joined and use this service,go to Mediumcom

Or if you want to win an iPhone this week or in the month ( to september) go right here.

Or go to my blog to read an official rule of this prize .