1. A method, comprising: identifying at least one visual meme associated with at least one topic in a data source, wherein the at least one visual meme includes a non-textual portion of an image; tracking the at least one visual meme, propagated over time, wherein the tracking includes performing visual feature matching by extracting visual features associated with identified visual memes and modeling the identified visual memes as links in people-content networks and as words in multimedia collections, the visual features including one or more color-correlograms extracted from one or more normalized frames for determining a similarity metric; and analyzing, using a processor, the similarity metric and the visual features associated with the identified visual memes, which determines at least one of generation, propagation, and use of the identified memes, the analyzing further comprising determining meanings of the identified visual memes using cross-modal matching based on the modeling.