When two people join a dating website, they are matched according to shared interests and how they answer a number of personal questions.

But how do sites calculate the likelihood of a successful relationship?

The site was unapologetic about the experiments, despite controversy over Facebook's study to test if it could manipulate users' emotions."Ok Cupid doesn't really know what it's doing," wrote Ok Cupid president Christian Rudder in a blog post Monday.

Nominate yourself here » Christian Rudder was the creative voice of The Spark.com, which was the viral content arm of Spark Notes during the site's early rise to popularity.

During Rudder's tenure at The Spark, it was one of the most popular humor sites on the web.

The popularity of Spark Match took off and it was launched as its own site, later renamed Ok Cupid.

The current Ok Cupid Dating Persona Test is still largely identical, in question and text blurb content and order, to the original Match Test.