On webide.se (free shell and web IDE) I use unix sockets alot!, for example nginx proxy from https://foo.user.webide.se to /home/user/socket/foo so that users can test their apps using HTTPS/SSL as many browser features need a httpS URL to work. Unix sockers are also used for accessing a shared mySQL server, and an x11 server so you can test out "native" apps and run Android emulator in the browser.