Abstract: Systems, methods and computer readable media for computing message delivery reliability are disclosed. In some implementations, the method can include generating message delivery reliability information based on statistics of receiving one or more codes returned from one or more users. The method can also include routing a subsequent message based on the message delivery reliability information. The routing can include selecting an aggregator to deliver the subsequent message based on the message delivery reliability information. Generating message delivery reliability information can include receiving a contact identifier for a user device, and generating a code. The method can also include sending a message containing the code to the user device via an aggregator using the contact identifier. The method can further include receiving the code from the user device and generating statistics based on the sending and receiving of the code.

Abstract: A system and method for generating user authentication challenges based on risk level is provided. A login request from a user is received. The login request includes identifying information associated with the user sending the login request. A risk analysis based on the identifying information associated with the user sending the login request is performed. A level of risk is identified. The level of risk is part of a risk index that includes multiple levels of risk. An authentication challenge based on the identified level of risk is generated. The login request is allowed or denied based on the completion on the authentication challenge.

Abstract: The present disclosure includes systems and methods for classifying user content (e.g., spam) within an online community by determining user specific signals and content specific signals, the systems and methods comprising: a user interface module configured to receive user content from the online community, a social signal processing module configured to determine signals from the user content, a user and content classifying module configured to classify user content and configured to compute a decision on the user content, a user content labeling module configured to label the user content, and an execution module configured to execute the decision.

Abstract: A system and method for generating user authentication challenges based at least in part on an account owner's social network activity information. A login request including an account owner's correct username and password as well as additional login information is received from a user. The login attempt is detected as a potentially fraudulent based on the additional login information from the user. The account owner's social network activity information is analyzed. An authentication challenge based at least in part on the account owner's social network activity information is generated and sent for display. The login request is allowed or denied based on the completion on the authentication challenge.

Abstract: A system and method for providing prepaid billing for users of an instant messaging system. A method includes determining whether a prepaid account balance associated with an IM client request satisfies a pre-determined criteria, establishing a regular IM session if the prepaid account satisfies the criteria, and establishing a limited IM session if the prepaid account does not satisfy the criteria. The system includes a prepaid account screener operable to determine whether a prepaid account balance satisfies the criteria, establish a regular IM session if the prepaid account satisfies the criteria, and establish a limited IM session if the prepaid account does not satisfy the criteria.

Abstract: A system and method for providing prepaid billing for users of an instant messaging system. A method includes determining whether a prepaid account balance associated with an IM client request satisfies a pre-determined criteria, establishing a regular IM session if the prepaid account satisfies the criteria, and establishing a limited IM session if the prepaid account does not satisfy the criteria. The system includes a prepaid account screener operable to determine whether a prepaid account balance satisfies the criteria, establish a regular IM session if the prepaid account satisfies the criteria, and establish a limited IM session if the prepaid account does not satisfy the criteria.

Abstract: A system and method for providing prepaid billing for users of an instant messaging system. A method includes determining whether a prepaid account balance associated with an IM client request satisfies a pre-determined criteria, establishing a regular IM session if the prepaid account satisfies the criteria, and establishing a limited IM session if the prepaid account does not satisfy the criteria. The system includes a prepaid account screener operable to determine whether a prepaid account balance satisfies the criteria, establish a regular IM session if the prepaid account satisfies the criteria, and establish a limited IM session if the prepaid account does not satisfy the criteria.

Abstract: A system and method for providing prepaid billing for users of an instant messaging system. A method includes determining whether a prepaid account balance associated with an IM client request satisfies a pre-determined criteria, establishing a regular IM session if the prepaid account satisfies the criteria, and establishing a limited IM session if the prepaid account does not satisfy the criteria. The system includes a prepaid account screener operable to determine whether a prepaid account balance satisfies the criteria, establish a regular IM session if the prepaid account satisfies the criteria, and establish a limited IM session if the prepaid account does not satisfy the criteria.

Abstract: A system and method for providing prepaid billing for users of an instant messaging system. A method includes determining whether a prepaid account balance associated with an IM client request satisfies a pre-determined criteria, establishing a regular IM session if the prepaid account satisfies the criteria, and establishing a limited IM session if the prepaid account does not satisfy the criteria. The system includes a prepaid account screener operable to determine whether a prepaid account balance satisfies the criteria, establish a regular IM session if the prepaid account satisfies the criteria, and establish a limited IM session if the prepaid account does not satisfy the criteria.