2016 international dating webiste
This raised questions from some users who wondered about the ease with which the company could eliminate users from its platform.
A February 2019 report alleged that many users reported lost access to their accounts in a manner consistent with either a data breach or a widespread "credential stuffing" incident.
Any adult may join the site and all users may communicate with others via private messages or an instant messaging "chat" function.
Ok Cupid was the first major dating site to offer unlimited messaging free of charge, although this was limited in late 2017 when Ok Cupid's official blog announced the site is "getting rid of open-messaging" and making sent messages invisible to the recipient until they in turn interact with the sender.
It is supported by advertisements, by paying users who do not see ads, and by selling user data for data mining.
In a separate A/B test, Ok Cupid used a placebo number instead of users' true match percentage.
The results suggested that doing this actually caused people, who were "bad matches" under the original algorithm, to actually like each other: "When we tell people they are a good match, they act as if they are." The revelation that Ok Cupid conducted these experiments on users led to much criticism.
Rudder prefaces the experiment results by stating: "...
if you use the Internet, you're the subject of hundreds of experiments at any given time, on every site.