Raised on YouTube is an installation and game that grows plants using only the light of projected video and makes ecology legible as a multiplayer game. The challenge of finding the most nurturing video is crowdsourced online. As players watch a webcam feed of the plants surrounded by two-way mirrors, their computer power is diverted to photosynthetic video analysis. The system calculates the photosynthetic score for each video using a basic botanical model. The resulting shape and density of the plant grow bed serves as a data visualization of the energy patterns in the cultural stream. The system provides opportunities to reflect on the effects of long-term exposure to contemporary media and to imagine ecological possibilities of participatory culture.