"Well son, it all started when your mom liked my selfie"

More than a third of marriages between 2005 and 2012 began online, according to new research at the University of Chicago, which also found that online couples have happier, longer marriages.
John Cacioppo, a psychologist and director of the Center for Cognitiveand Social Neuroscience at the University of Chicago, says dating sites may "attract people who are serious about getting married".
Relationships that start online may benefit from selectivity and the focused nature of online dating, the authors said. The differences in marital outcomes from online and offline dates persisted after controlling for demographic differences, term marital relationship, or some other factor. (Cacioppo).
Meeting online also may provide a larger pool of prospective marriage partners, along with advance screening in the case of dating services. And although deception often occurs online, studies suggest that people are relatively honest in online dating encounters; the lies tend to be minor misrepresentations of weight or height.

Reference:

William Harms; University of Chicago; 2013.