Socket.IO aims to make realtime apps possible in every browser and mobile device, blurring the differences between the different transport mechanisms.
http://socket.io
JavaScript Libraries and Functions · JavaScript Library
Get access to data on 252,858 websites that are Socket.IO Customers. We know of 57,397 live websites using Socket.IO and an additional 195,461 sites that used Socket.IO historically and 25,356 websites in the United States.
Get a list of 252,858 websites using Socket.IO which includes location information, hosting data, contact details, 57,397 currently live websites and an additional 155,666 domains that redirect to sites in this list. 195,461 sites that used this technology previously and 25,356 websites in the United States currently using Socket.IO.