I run a team responsible for outreach and public relations for CERN's IT Department. CERN is 'where the web was born' and is now developing Grid technology for science, and in particular for the Large Hadron Collider, the world's largest scientific instrument, due to start operations this year. 'From volunteer computing to volunteer thinking'. The SETI@home project has millions of people donating spare time on their computers for a scientific cause. Today there are dozens of projects, in fields like climatology, molecular biology and particle physics, that benefit from such volunteer computing. But this is just the tip of the iceberg. A new generation of projects taps into the brains of the volunteers, inviting them to analyze scientific data online: cataloguing galaxies, scouring microscope images, or mapping out remote regions. I call this trend citizen cyberscience. It is social networking with a purpose. It is philanthropic crowdsourcing. It is grid computing for the masses. In my talk, I'll discuss the profound implications of citizen cyberscience for the public understanding of science, and for scientists' understanding of the public. In particular, I'll describe what we've learned from two projects CERN helped to launch, LHC@home and Africa@home.