Others utilize the freemium revenue model, offering free registration and use, with optional, paid, premium services.
Still others rely solely on paid membership subscriptions.
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.
Introduction sites differ from the traditional online dating model, and attracted a large number of users and significant investor interest.
It is possible that the mode of online dating resonates with some participants' conceptual orientation towards the process of finding a romantic partner.
That is, online dating sites use the conceptual framework of a "marketplace metaphor" to help people find potential matches, with layouts and functionalities that make it easy to quickly browse and select profiles in a manner similar to how one might browse an online store.
An online dating service is a company that provides specific mechanisms (generally websites or applications) for online dating through the use of Internet-connected personal computers or mobile devices.
Such companies offer a wide variety of unmoderated matchmaking services, most of which are profile-based.
Most services also encourage members to add photos or videos to their profile.Members can constrain their interactions to the online space, or they can arrange a date to meet in person.A great diversity of online dating services currently exists.Some have a broad membership base of diverse users looking for many different types of relationships.Other sites target highly specific demographics based on features like shared interests, location, religion, or relationship type.Dedicated to verified college students and alumni (via education database). Alumni cannot initiate or respond to contact or post status updates.