This article provides some great input into why Node.js is becoming so vastly popular. The future of web applications requires that apps be very powerful, be able to support millions of users, and do it all in real time. Those are some of Node.js’ strengths so it may just fit the bill. Big companies such as Twitter has realized Node.js’ power and has switched portions of its infrastructure from Ruby on Rails to Node.js. Likely, other companies will follow suit as the framework matures.
O’Dell, J., (March 10, 2011) Why Everyone Is Talking About Node. Retrieved November 17, 2012 from http://mashable.com/2011/03/10/node-js/