Abstract: Systems and methods for displaying advertisements on a portable device that utilizes an Activity-based operating system are described. The method includes receiving an indication that an Activity is being transitioned away from, and determining whether or not the Activity is finishing. Upon determining that the Activity is finishing, the method includes causing an advertisement display routine to be executed immediately, otherwise submitting the advertisement display routine into a processing queue to be executed subsequently. The advertisement display routine displays the advertisement only upon determining that the state of the Activity and the state of the portable device are characterized by one or more predetermined conditions.

Abstract: Systems and methods for providing online sales and advertising are disclosed. A system may be configured to provide an online advertisement and, responsive to a received request for information regarding the advertisement from a potential buyer, provide information related to the advertisement to a seller to facilitate a sales transaction. The response may be facilitated by customized ANI processing.