The first e-mail was sent just over 40 years ago; we've come a long way, baby. But along with the highs (Twitter-enabled revolutions, Chatroulette), there have been a lot of lows (Kim Kardashian's tweets, Chatroulette). These are the moments that are worth remembering and, in some cases, cringing about. Plus: See our complete coverage of social media mavericks. read more
A new breed of applications do more than just provide services—they nurture a complete social experience that combines the best of the real and digital worlds. Here, a guide to the emerging tools transforming the way you live. read more
Beyond the search, chat, and map functions, Google offers more than 300 features—some obscure, all gratis. Here, four of its most useful add-ons. read more