Abstract: Techniques are described for providing location-based information and functionality to people and computing devices in various ways. In at least some situations, the techniques include enabling multiple people in a common geographic area to interact in various ways, such as via devices capable of communications (e.g., cellular telephones, computing devices with wired and/or wireless communications capabilities, etc.). In addition, the techniques include enabling the creation and maintenance of location-based virtual groups of users (also referred to as “clouds”), such as for users of mobile and/or fixed-location devices. Such clouds may enable various types of interactions between group members, and may be temporary and/or mobile.

Abstract: A method and system for providing a pay-for-visit billing model for advertisements is provided. The advertisement system provides advertisements that have associated physical visit locations. The advertisement system provides advertisements to a mobile device or fixed of a user when the user is in the vicinity of or examining locations in the vicinity of the visit location. If the user subsequently visits the visit location of the advertisement by physically going to the location, the advertisement system then bills the advertiser for the advertisement. The advertisement system bills the advertiser under the assumption that but for the advertisement, the user would not have visited the visit location.