A social networking system identifies communications about an object associated with a brand owner. For each communication, the social networking system identifies users who were generated the communication, users who were exposed to the communication, and users who were not exposed to the communication. The social networking system determines a sentiment associated with a communication and may send a report based on the sentiment of the communications towards the brand owner. A request from a brand owner to present one or more response communications to users based on the users' relationship to a communication from a user about the object and the sentiment determined from the communication may be received by the social networking system. Based on the request, the social networking system presents a response communication to one or more users.
In one embodiment, a method includes identifying an emotion associated with an identified first object in one or more input images, selecting, based on the emotion, a mask from a set of masks, where the mask specifies one or more mask effects, and for each of the input images, applying the mask to the input image. Applying the mask includes generating graphical features based on the identified first object or a second object in the input images according to instructions specified by the mask effects, and incorporating the graphical features into an output image. The emotion may be identified based on graphical features of the identified first object. The graphical features of the identified object may include facial features. The selected mask may be selected from a lookup table that maps the identified emotion to the selected mask.
In one embodiment, a method includes a computing system receiving a request to create a live streaming channel associated with a television program. The system may determine a plurality of breaks of the television program and their respective start times. The system may identify target users of a social-media network based on their respective user profiles, social-graph data, or activity patterns on the social-media network. The system may create the live streaming channel based on the request. Upon determining that a current time is within a predetermined time window prior to a first start time of a first break of the plurality of breaks, the system may send notifications to the target users, wherein each of notifications includes a link to the live streaming channel through which live content related to the television program may be streamed.