Other sites target highly specific demographics based on features like shared interests, location, religion, sexual orientation or relationship type.

Online dating services also differ widely in their revenue streams.

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Profiles created by real humans also have the potential to be problematic.

For example, online dating sites may expose more female members in particular to stalking, fraud, and sexual violence by online predators.

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.

In Eastern Europe, popular sites offer full access to messaging and profiles, but provide additional services for pay, such as prioritizing profile position, removing advertisements, and giving paying users access to a more advanced search engine.

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.

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.