1. A computer-implemented method of identifying a user as a person of interest, the method comprising: receiving an indication of a topic input provided by the user; generating, with a computer processor, a shared topic feed that includes the topic input; distributing the shared topic feed to one or more other users; receiving a user interaction indication indicative of the one or more other users interacting with the topic input in the shared topic feed; and providing an output indicating the user as a person of interest based on the user interaction indication.