Launched in 2004, OKCupid works with many populations of people.
Mingle2 is a membership service of which users pay to be a part.
It is one of the biggest dating sites with over 90 million registered users across the globe. OKCupid is one of the most popular dating sites and is free to sign up initially.
It works with special algorithms that match users with potential dates.
It launched in 1995 and is now available in 24 different countries.