Still others rely solely on paid membership subscriptions.Opinions and usage of online dating services also differ widely.

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A 2005 study of data collected by the Pew Internet & American Life Project found that individuals are more likely to use an online dating service if they use the Internet for a greater number of tasks, and less likely to use such a service if they are trusting of others.

It is possible that the mode of online dating resonates with some participants' conceptual orientation towards the process of finding a romantic partner.

Some sites are completely free and depend on advertising for revenue.

Others utilize the freemium revenue model, offering free registration and use, with optional, paid, premium services.

Such sites earn revenue from a mix of advertising and sale of additional options.

This model also allows users to switch between free and paying status at will, with sites accepting a variety of online currencies and payment options.Most free dating websites depend on advertising revenue, using tools such as Google Ad Sense and affiliate marketing.Since advertising revenues are modest compared to membership fees, this model requires a large number of page views to achieve profitability.Niche sites cater to people with special interests, such as sports fans, racing and automotive fans, medical or other professionals, people with political or religious preferences (e.g., Hindu, Jewish, Christian, Muslim, etc.), people with medical conditions (e.g., HIV , obese), or those living in rural farm communities.In 2008, a variation of the online dating model emerged in the form of introduction sites, where members have to search and contact other members, who introduce them to other members whom they deem compatible.At the end of November 2004, there were 844 lifestyle and dating sites, a 38% increase since the start of the year, according to Hitwise Inc.