Facebook app lets you 'Bang With Friends' San Francisco Chronicle Copyright 2013 San Francisco Chronicle. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Updated 5:05 pm, Wednesday, February 13, 2013 The app's logo and introductory screen shot leave no doubt about its intent. Since launching on Jan. 23, the app has "already hooked up over 100,000 couples," according to an e-mail from the three California college students who created the app. The app has also been called "The Evilest App Ever" by the student-oriented group InterVarsity Christian Fellowship USA, which says finding Facebook friends with benefits can only hurt loved ones, lead to marital infidelity and add unnecessary emotional baggage. Apps like Bang with Friends aren't necessarily bad if all you're looking for is casual sex, which for some people is like going to the gym, said Weiss, author or co-author of books like Cybersex Exposed: [...] over-reliance on such technology could make it harder for some people to develop the dating and social skills they need to find more lasting, emotionally satisfying relationships, he said.