In one embodiment, a method includes receiving a content posting from a device associated with a first user, the content posting including data representative of a content instance and a geographic location associated with the content instance; determining that a second user is associated with the geographic location associated with the content instance, wherein the determination is based on a first client device associated with the second user being or having been within a predefined proximity of the geographic location associated with the content instance; and authorizing, based on the second user being associated with the geographic location associated with the content instance, a second client device associated with the second user to submit an annotation to the content instance.

Techniques for leveraging a social graph to facilitate the delivery of relevant recommendations. For example, a recommender is identified based on the recommender being a member of a social networking service who has interacted with an item of web-based content. A recommendee is identified based on the recommendee being another member of the social networking service who is connected to the recommender via a social graph maintained by the social networking service and based on having an affinity score for the item that exceeds a recommendee affinity score threshold and a connection strength to the recommender that exceeds a connection strength threshold. The recommender is sent a communication that invites the recommender to recommend the item to the recommendee. With some example embodiments, the communication is sent to the recommender within a pre-determined time measured from the time the recommender initiated an interaction with the item of web-based content.

Systems and methods are described herein for analyzing messages and other information provided in relation to a web communication, a mobile application communication session, a phone communication, or another type of communication. For example, a system and method are provided for initiating a text message communication session between an agent and a user. A two-way communication session may be facilitated between the user and the agent. A mobile telephone number disclosed by the user during the two-way communication session may be detected, and a text message communication session between the user and the agent may be initiated if a mobile telephone number was detected. Availability status associated with a provider of items or services may also be analyzed to determine an agent for communicating with the user.

A method and system for receiving digital artifacts from a management server. The method includes sending a request for a digital artifact from a mobile application to the management server for display within a specific mobile application generated screen, receiving the digital artifact from the management server, and displaying the digital artifact with the specific mobile application generated screen.

A system and method is disclosed for advertising through a social network by immersion of participants in a sponsored mobile game. A game application for the sponsored game is developed on a server and deployed on consumer devices connected to the server. The game application, operating on a smart phone, utilizes onboard GPS and camera subsystems to carry out and facilitate the game functions. A dashboard is provided for designing the game around an advertising campaign. The game application is syndicated and shared through a consumer's social media community. The game is tracked by the server. Game information and rewards are delivered to participants during and after the game. In one aspect, the game involves a participant gathering digital permits prior to and during the game which are used to complete a tagging event with other participants. Rewards such as redeemable coupons are based on actions at sponsor locations.

A computer process enables a target window associated with a first domain to receive a message from a child window associated with a second domain. The message is passed using an iframe that is created within the target window. The process may, for example, be used to relay information entered by a user into the child window to the target window.

Existing infrastructure for processing credit card transactions at point-of-sale (POS) devices is leveraged to provide secure and convenient payment with a mobile device. A mobile transaction infrastructure that is integrated with the credit card interchange network receives information from the mobile device and passes this information to a gateway provider or a payment processor. By combining information from both the mobile device and the POS device, this backend infrastructure can uniquely identify a transaction and appropriately charge an account associated with the user of the mobile device. The transaction may be matched with the mobile device be based on location, time, transaction charge, and/or other factors.

An online system receives a discount offer from a merchant and displays the offers to users. Some of the discount offers provide for a discount that becomes valid when the discount offer is displayed to the user and remains valid for an offer duration. To implement these discount offers, a timestamp representing the time at which the discount offer is displayed is recorded and encoded. The encoded timestamp is provided to the merchant system when the user makes a purchase. The merchant extracts the recorded timestamp from the encoded timestamp and compares the recorded timestamp to the time of the purchase. If the time elapsed between the timestamp and the purchase is less than the offer duration, then the merchant system applies the discount to the purchase.

Buyer profile management is described herein. In an example, a payment processing service can store, in a database, buyer profiles associated with buyers involved in point-of-sale (POS) transactions with one or more merchants of the payment processing service. The payment processing service can receive transaction data associated with a new POS transaction between a buyer and a merchant and can determine whether the transaction data corresponds to any of the buyer profiles. Based at least in part on determining whether the transaction data corresponds to any of the buyer profiles, the payment processing service can update the database storing the buyer profiles, wherein updating the database comprises (i) associating the transaction data with an existing buyer profile, (ii) merging two or more buyer profiles, or (iii) adding a new buyer profile.

A contextual services delivery system may comprise a services repository containing services instructions and a contextual services delivery module. The contextual services delivery module may deliver different contextual services to a smartphone and/or a POS terminal in response to a context environment, in order to provide a user with a customized contextual services experience.