1. A system for processing a set of social media (SM) streams, comprising: a user interface for selecting the set of SM streams and for inputting a set of filtering definitions; a stream unification system that creates a single unified stream from the set of SM streams; a content filtering system that selects relevant content items from the single unified stream based on the set of filtering definitions and generates a unified filtered SM stream using selected content items; and an output system that outputs the unified filtered SM stream to a user display.