This document discusses how journalism and the relationship between journalists and sources is changing in social media spaces. It focuses on how participatory and "ambient" journalism on platforms like Twitter allows citizens to both consume and produce small pieces of content that can collectively be considered journalism. It profiles how one journalist, Andy Carvin, uses Twitter to amplify certain voices and do his work. Key questions are raised about how social media impacts sourcing, verification, and the benefits and challenges it presents for journalism.