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 327,754 websites that are Socket.IO Customers. We know of 79,887 live websites using Socket.IO and an additional 247,867 sites that used Socket.IO historically and 47,015 websites in the United States.
Get a list of 327,754 websites using Socket.IO which includes location information, hosting data, contact details, 79,887 currently live websites and an additional 220,745 domains that redirect to sites in this list. 247,867 sites that used this technology previously and 47,015 websites in the United States currently using Socket.IO.