Online dating has to some extent taken over from less traditional forms of dating, such as personal ads and video dating. As Whitty and Carr (2006) report in their book Cyberspace Romance: The Psychology of Online Relationships, online dating is increasingly becoming a popular way to find a match-so much so that they believe that online dating is here to stay (although the format will probably change). Houran et al. (2004) report that in 2004 web services accounted for approximately 43 percent of the $991 million United States dating service sector. They also report that Jupiter Research expects online dating sites to record over $640 million by 2007.