In one embodiment, a method includes accessing content objects of an online social network, each content object being associated with an entity of the online social network, where each content object includes content of the content object and is associated with metadata, generating a set of n-grams by extracting one or more n-grams from the content of the content object, calculating, for each extracted n-gram, a quality score for the n-gram based on occurrence counts associated with map tiles of a geographical map, where each occurrence count comprises a count of entities geographically located in a corresponding map tile and associated with the n-gram, generating a snippet-module including one or more of the extracted n-grams from the set of n-grams having quality-scores greater than a threshold quality-score, and sending, to a client system of a user of the online social network, the snippet-module for display to the user.