Such companies offer a wide variety of unmoderated matchmaking services, most of which are profile-based.

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While some sites conduct background checks on members, many do not, resulting in some uncertainty around members' identities.

For instance, some profiles may not represent real humans but rather "bait profiles" placed online by site owners to attract new paying members, or "spam profiles" created by advertisers to market services and products.

Introduction sites differ from the traditional online dating model, and attracted a large number of users and significant investor interest.

In Eastern Europe, popular sites offer full access to messaging and profiles, but provide additional services for pay, such as prioritizing profile position, removing advertisements, and giving paying users access to a more advanced search engine.

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.

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.

Most free dating websites depend on advertising revenue, using tools such as Google Ad Sense and affiliate marketing.