It is supported by advertisements and paying users who do not see ads.
The site supports multiple modes of communication, including instant messages and emails.
"If you use the Internet, you're the subject of hundreds of experiments at any given time, on every site," Christian Rudder, president of OKCupid, wrote on the blog.
"That's how websites work." The first test in January 2013 was masked as a "Love is Blind" day. They found that site traffic dropped dramatically, but users who did contact potential matches on that day had more meaningful conversations.
What do you think about websites manipulating their users for scientific studies?
) is an American-based international operating online dating, friendship, and social networking website that features multiple-choice questions in order to match members.
Ok Cupid was listed in Time magazine's 2007 Top 10 dating websites.
Ok Cupid was initially owned by Humor Rainbow, Inc.
Ok Cupid's founders (Chris Coyne, Christian Rudder, Sam Yagan, and Max Krohn) were students at Harvard University when they gained recognition for their creation of The Spark and, later, Spark Notes.
Among other things, The featured a number of humorous self-quizzes and personality tests, including the four-variable Myers-Briggs style Match Test.
After the test ended, the site sent emails explaining the compatibility scores test to anyone who had been shown altered scores.
"I understand that that experimentation is part of the process," Zaz Harris, a 37-year-old OKCupid user told the Times.
"People come to us because they want the website to work, and we want the website to work." The revelation about OKCupid's testing came after Facebook users learned about similar experiments conducted on them.