Abstract: Member profile information for a control set of one or more control members and for a fraudulent set of one or more fraudulent members are obtained. Each member in the control set is at least believed to be legitimate and each member in the fraudulent set is at least suspected of being fraudulent. A test associated with identifying fraudulent members is generated using the member profile information for the control set and for the fraudulent set; the test inputs one or more pieces of member profile information for a member being tested.

Abstract: People are matched by obtaining, for a set of people, response information associated with previous matches the set of people have been a part of. For a person being matched, response information associated with previous matches the person being matched has been a part of is obtained. A match candidate is selected from a set of match candidates based at least in part on (1) the response information associated with the person being matched and (2) the response information associated with the set of people. Information associated with the selected match candidate is sent to the person being matched and/or information associated with the person being matched is sent to the selected match candidate.

Abstract: Member profile information for a control set of one or more control members and for a fraudulent set of one or more fraudulent members are obtained. Each member in the control set is at least believed to be legitimate and each member in the fraudulent set is at least suspected of being fraudulent. A test associated with identifying fraudulent members is generated using the member profile information for the control set and for the fraudulent set; the test inputs one or more pieces of member profile information for a member being tested.

Abstract: A test to identify fraudulent users of an online group is generated. Data associated with a control group is obtained. Data associated with a fraudulent group is obtained. A test to identify fraudulent users of the online group is generated by comparing the data associated with the control group and the data associated with the fraudulent group.

Abstract: The functions and operations of a matching service are disclosed. This includes approximating the satisfaction that a user of the matching service has in the relationships that the user forms with others and identifying candidates for a relationship with the user based on the approximated satisfaction. This also includes approximating the satisfaction that the user will have in a relationship with a particular candidate. The matching service also identifies two parties for a relationship. The matching service makes available a plurality of communication levels at which the parties can communicate. Each communication level allows the parties to exchange information in a different format. The parties are permitted to exchange information at one of the communication levels.