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Then comes the choice to send a person a message, or to reply to one.
And of course, the final, crucial decision, which isn't captured by these data: whether to meet the person in the real world.
Besides photographs, each user's profile could include any number of personal details including age, height, weight, education, marital status, number of children, and smoking and drinking habits.
The data set includes some 1.1 million interactions between users.
Those 30 million people have generated billions of pieces of data.
And because most dating sites ask users to give consent for their data to be used for research purposes, this online courting has played out like an enormous social science experiment, recording people's moment-by-moment interactions and judgments.
 uses information such as middle-finger-to-ring-finger length ratios (digit ratio), an indication of testosterone levels, and personality type matching assessments, such as by asking people "do you like to count things"; counters have high dopamine levels and tend to be the "explorer type".
Smoking was another big deal breaker, associated with a 10-fold drop in interest.A team led by Elizabeth Bruch, a sociologist at the University of Michigan, Ann Arbor, tapped into this torrent of dating data.Because of a nondisclosure agreement, the researchers can't reveal the exact source of their subjects, describing it only as an "established, marriage-oriented, subscription-based dating site" from which they randomly selected 1855 people, all based in New York City.These patterns also generally held for the second step, messaging, but with smaller effects. The results convince Ken-Hou Lin, a sociologist at the University of Texas, Austin, who also studies online dating."The science is absolutely solid." He suspects that deal breakers are more important at the early stage of mate selection when people are winnowing down a pool of candidates.