In fact, they’re not even exclusively for dating, as Ok Cupid allows you to be married or in a relationship but looking for friends.
When someone contacts you, you can see how much of a “Match,” “Friend,” or “Enemy” they are based upon how their answers compare to yours.
You’re Matched According to Answers Ok Cupid matches you with others not only based on your browsing activity on the site, but also based on the way you answer a number of introductory questions.
Examples of the questions include: You can set your answers to be publicly available, or you can choose to set all (or some) to private.
To help answer that question, keep the following in mind: Free sites are geared toward casual daters, while paid sites tend to be for people looking for a serious relationship.
Of course, it’s not always that simple, and there are exceptions.