For most people, it all began with Skype. The popular service, acquired by Microsoft in May 2011 for $8.5 billion, combines voice, video and instant messaging communication over the Internet. The user-friendly Skype -- it reached verb status: "Let's Skype" -- made video chatting safe for technophobe grandfathers everywhere and has expanded to mobile apps for use on smartphones and tablets. As of September 2011, Skype had 663 million registered users. Other consumer videoconferencing services include iChat for Mac users, Google Hangouts (via Google+), and newer entries SightSpeed, ooVoo and Tokbox.