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Online dating (or Internet dating ) is a system that enables strangers to find and introduce themselves to new personal connections over the Internet , usually with the goal of developing personal, romantic, or sexual relationships. 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.
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. 
Since 2003, several free dating sites, operating on ad based-revenue rather than monthly subscriptions, have appeared and become increasingly popular. [ citation needed ] Other partially free online dating services offer only limited privileges for free members, or only for a brief period. [ citation needed ] Although some sites offer free trials and/or profiles, most memberships can cost upwards of $60 per month.