Some sites such as Ok Cupid.com, and are free and offer additional paid services in a freemium revenue model.
Some sites are broad-based, with members coming from a variety of backgrounds looking for different types of relationships.
In Germany government financed NGOs like "Verbraucherschutzzentrale" sometimes help to sue online dating sites.
This problem is referred to as "catfishing" in pop-culture and has been made famous by a popular MTV program called "Catfish the TV show".
Users of an online dating service would usually provide personal information, to enable them to search the service provider's database for other individuals.
Members use criteria other members set, such as age range, gender and location.
3 popular and effective websites are: Plenty of Fish, Ok Cupid, and (where you can meet someone that has a similar taste in music as you).Online dating sites use market metaphors to match people.