Other sites target highly specific demographics based on features like shared interests, location, religion, or relationship type.
Some have a broad membership base of diverse users looking for many different types of relationships.
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.
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.
The parents' lawsuit alleges photos of their son, who was killed in Iraq in 2007, were used without permission.