How a simple photo lays bare the personal details of ordinary people

Almost every day brings new revelations about how Big Brother snoops on us and Big Data mines our online activities for profit. Even so, we are only beginning to understand the power of these incursions. In a few years, our faces alone, snapped on a street, in a crowd, or posted by a friend on the Internet, will be the key for a search engine to reveal the stories of our lives. There may be nothing that technology is changing more dramatically than privacy. What is happening with our images online is just one example of our digital reality: We're living life out loud -- secrets and all.