I was once approached to help build something like that for a prison. Essentially, it'd match the prisoner to their mugshot to ensure the right person was let o

I was once approached to help build something like that for a prison. Essentially, it'd match the prisoner to their mugshot to ensure the right person was let out. I turned the position down, as when I asked about how they would store the eigen-vectors for that many people and index them I was met with an awkward silence. I do like the idea of processing Facebook's data, but that's another plan entirely.