It's connection with btccharts.com socket server. For now it just count online users. After this weekend this should also rebroadcast data from mtgox socket. And later will be used for things like chat.
Is the rebroadcast idea to lessen the load (number of connections) on Gox? If so, that might be a great idea. You could advertise and push people to use your rebroadcast of socket.io and since you don't have to focus on other things like Gox does you could tune performance and keep it stable.
My assumption is that almost always there's some btccharts client with good mtgox socket connection. Every client will be reporting to server on this connection status. Max 3 clients with good connection will be sending to btccharts socket server data from mtgox socket, and then this will be rebroadcasted to clients that reports bad connection.
So the answer is no - still all clients will be connected. This will increase the chance to get at least one with good connection.
In future maybe I will talk with mtgox on some dedicated socket for my server, so btccharts don't use mtgox, so there's less connections, so this will be more stable for others.
Mushoz - currently there's no restart of settings. But you can do that by cleaning flash cookies:
- press right mouse button
- select settings
- select local storage tab
- decrease slider to 0KB, "OK", "close"
- restart page and click "allow"
! A button to reset the settings to default and this thing's complete IMO 
