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.
SOURCE: Consumer Reports "It's clear that online dating websites play a major role in the lives of many consumers — we invest a tremendous amount of time, money and emotional energy.
It really is a consumer issue worthy of our attention." said Margot Gilman, money editor for Consumer Reports.
More than half, or 53 percent, of single people have created a dating profile, according to Match's recent Singles in America study, which polled over 5,000 single men and women in December.