The data was sold and traded before 000webhost was alerted in October.
The breach included names, email addresses and plain text passwords.
Marketing firm Jana asked 1,500 18 to 30-year-olds in nine countries, pictured, where they go online when looking for a relationship.
Facebook was the most popular across the board, with Twitter coming in second and even My Space making the top three in certain regions The highest proportion of people who had met someone online was in Vietnam, at 67%, pictured, whereas only a quarter of people in Brazil said they had gone on online dates.
The data was being actively traded on underground forums and included email addresses, birth dates and passwords.