7. The method of claim 1 , further comprising: determining entities and categories associated with the plurality of mobile device activities by processing information about a plurality of mobile device applications, the information including at least one of a name, a summary, a description, a review, a rating, and an identifier; and determining whether the determined semantic information about the indicated content item includes one or more of the determined entities and categories associated with the plurality of mobile device applications.
1. A method for recommending mobile device activities, the method comprising: receiving an indication of a content item contained on a Web page that is currently presented by a mobile device; determining semantic information about the indicated content item, including accessing a semantic network that is a graph data structure that includes multiple entities that each have is-a and/or member-of relations to other entities or categories of the semantic network, wherein the is-a and/or member-of relations are represented as links between the entities or categories of the semantic network, to: identify one or more entities in the semantic network that are referenced by the indicated content item and relationships relating to the identified entities; identify one or more entities in the semantic network that are related to the identified one or more entities; and identify one or more categories in the semantic network that are associated with the identified one or more entities and/or the related one or more entities, wherein the identified one or more categories are part of a taxonomic hierarchy in which each of the identified one or more categories is part of a corresponding taxonomic path that includes multiple categories related to one another via is-a relations, wherein the one or more categories are identified by traversing the links representing relations within the semantic network by traversing at most N taxonomic paths within the semantic network, where N is determined by user setting or data mining; determining a plurality of mobile device activities, wherein each activity has one or more associated entities and/or categories in common with the determined semantic information; and transmitting information about the determined plurality of activities.