According to New York City psychologist and author Vivian Diller, the seven-year study was too short to assess the long-term outcomes of relationships that begin online.
"Success in marriage is largely about how you negotiate differences, not just compatibility," she told AFP, adding that online dating can raise expectations and result in greater unhappiness.
Eli Finkel, a professor of social psychology at Northwestern University, led an extensive review of the science published about online dating last year.
He told AFP he agreed with the proportions found in the PNAS study.
The dating site is regarded as one of the most secure, clean and professional online friendship website on the Internet.
With the closing of this site all bank accounts associated with KEVLYN are also going to close."These data suggest that the Internet may be altering the dynamics and outcomes of marriage itself," said Cacioppo."It is possible that individuals who met their spouse online may be different in personality, motivation to form a long-term marital relationship, or some other factor." But not all experts believe that online dating translates into instant bliss.Cacioppo acknowledged being a "paid scientific advisor" for the website, but said the researchers followed procedures provided by the Journal of the American Medical Association and agreed to oversight by independent statisticians.People who reported meeting their spouse online tended to be age 30-49 and of higher income brackets than those who met their spouses offline, the survey found.