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 214,533 websites that are Socket.IO Customers. We know of 52,573 live websites using Socket.IO and an additional 161,960 sites that used Socket.IO historically and 28,153 websites in the United States.
Get a list of 214,533 websites using Socket.IO which includes location information, hosting data, contact details, 130,197 currently live websites which includes 77,624 domains that redirect to sites in the list. 161,960 sites that used this technology previously and 28,153 websites in the United States currently using Socket.IO.