Other sites target highly specific demographics based on features like shared interests, location, religion, or relationship type.
Online dating services also differ widely in their revenue streams.
Most services also encourage members to add photos or videos to their profile.
Once a profile has been created, members can view the profiles of other members of the service, using the visible profile information to decide whether or not to initiate contact.
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.
Further, during this period, the usage among 18- to 24-year-olds tripled, while that among 55- to 65-year-olds doubled.Overall, respondents preferred free sites like Ok Cupid, Tinder and Grindr over paid sites like Match and e Harmony, in part because of the value.