After three years of research in collaboration with Galen Buckwalter, Warren developed a model of compatibility that is now the basis of the company's matching system.
A recurring complaint by eharmony customers for years is the misuse of the website to incur auto-renewals from members.
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In the late 1990s, Warren said he decided to test his theory that certain characteristics can predict compatibility and lead to more satisfying relationships.
In 2010, e Harmony settled a separate class-action lawsuit filed in California that alleged illegal discrimination based on sexual orientation.
The company, which did not admit wrongdoing, agreed to allow access to both its gay and straight dating sites with a single subscription, to display its gay dating services more prominently and to establish a settlement fund to pay people who can show they were harmed by the company's policies.
One of the first free dating apps on the scene, Zoosk is integrated with Facebook and Google , which makes it even easier to sign up and start searching for your match.
Not only does Zoosk have a free app for i Phone and Android, but it also has a free Facebook-specific app, allowing you to choose which one works best for your needs.
Users looking for a same-sex relationship will be matched on e Harmony's sister site,