markfeffer writes: "Make all the comments you want about online pornography, but at the end of the day it’s a bigger chunk of the Web than you may realize. Adult destinations make up 12 percent of all sites globally and generate 35 percent of all downloads. A quarter of all searches are about finding them. As a business, they make a lot of money, about $3 billion in the U.S. alone during 2010 (That’s $4,000 a second, by the way). Behind the scenes, one of the more interesting operations is the fetish network Kink.com. To handle between 2,500 and 3,000 simultaneous users its, sites run clustered and load-balanced on five JBoss application servers. The front end uses Java, J2EE and JBoss 6.7, and its social approach is built in Spring Social hosted with JBoss 7. Steve Morgan, the company’s CTO, has a full-time tech staff of 26, out of the company’s 130 full-time employees. He says he does use consultants but the talent side of the business uses more."