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The figure is higher in more sparsely-populated areas and lower in cities. For college graduates, about 28 percent of those who are married attended the same college, according to the Facebook survey. Online dating is becoming incredibly common: A survey by Pew in 2013 found that 11 percent of American adults and 38 percent of those who were "single and looking" for a partner had used online dating sites or mobile dating apps. In the map below by Jonathan Soma, the size of the blue dots indicates the relative excess in each city of bachelors ages 20 to 34. 19, same-sex marriage was legal in 36 states and D. In a poll by the Public Religion Research Institute, for example, almost a third of Americans said different religious beliefs present a major problem for a marriage or romantic relationship, while 17 percent said the same for different political views.