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.

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Over 50% of research participants in a 2011 study did not view online dating as a dangerous activity, whereas 43% thought that online dating involved risk.

Because online dating takes place in virtual space, it is possible for profile information to be misrepresented or falsified.

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 offer digital messaging, while others provide additional services such as webcasts, online chat, telephone chat (VOIP), and message boards.

Members can constrain their interactions to the online space, or they can arrange a date to meet in person.Such companies offer a wide variety of unmoderated matchmaking services, most of which are profile-based.Online dating services allow users to become "members" by creating a profile and uploading personal information including (but not limited to) age, gender, sexual orientation, location, and appearance.Still others rely solely on paid membership subscriptions.Opinions and usage of online dating services also differ widely.Introduction sites differ from the traditional online dating model, and attracted a large number of users and significant investor interest.