Big data is still one of those concepts that baffle me. How big does the data have to be? Where does it come from? And how can nonprofits and public libraries actually make use of it? At SOCAP13, a social enterprise conference in San Francisco, I attended two back-to-back panel presentations on big data with some nonprofit representation. Hearing directly from those working in big data for good gave some context around what's actually happening. Still, though, I had some questions around the definition of big data — and it seemed like the presenters did too.