Especially popular in Eastern Europe, some sites offer full access to messaging and profiles, but provide additional services for pay, such as bumping profiles up to the top of the list, removing advertisements, making paying users' profiles appear several times in different places in the search results, and giving paying users a more advanced search engine to work with (in one example, free users may only search for persons of specified age, gender, orientation, and city, while subscribers may search for any and all parameters listed in profiles, such as height, weight, interests, etc.).
Also, this model generally allows users to switch between free and paying status at will and without having to do anything, simply providing advanced features for a set period of time whenever the according payment is received.
Some sites are broad-based, with members coming from a variety of backgrounds looking for different types of relationships.
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Other sites depend on advertising for their revenue.
Some sites such as Ok Cupid.com, and are free and offer additional paid services in a freemium revenue model.
Ease of payment is also generally higher, with such sites accepting a variety of online currencies, letting users charge the payment to their cellular phones, etc.
Such sites earn revenue from a mix of advertising and sale of additional options.
Members use criteria other members set, such as age range, gender and location.
Online dating sites use market metaphors to match people.
The matchmaking service make members fulfill personality test, which can sometimes reach about one hundreds of pages, and suggest members who are likely to match.
The site is founded on the works of the German psychologist Hugo Schmale and the (subsidiary of Match.com) on the studies of the American anthropologist Helen Fisher.
Sites may offer additional services, such as webcasts, online chat, telephone chat (VOIP), and message boards.