More recently, the impact of social networking on online dating has been featured on the Questia online research website peer reviewed article ""I Luv U : )!

": A Descriptive Study of the Media Use of Individuals in Romantic Relationships" The most popular platforms are Twitter, Snapchat, Linked In and Instagram.

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.

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. By 2007, many prominent studies show that Baby Boomer interest in online dating have soared.

However, market share was increasingly growing by several large commercial services, including Personals. Some online dating websites provide webcam chats between members.

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

Online daters may have more liberal social attitudes compared to the general population in the United States.

Since 2003, several free dating sites, operating on ad based-revenue rather than monthly subscriptions, have appeared and become increasingly popular.

Several newer sites such as Ok are beginning to offer more full featured dating services for free, and are starting to compete with staples in the free dating site world such as

Online dating sites use market metaphors to match people.