At the end of the fourth quarter of 2009, Skype had 560 million registered users, according to the company’s chief technology strategist, Jonathan Rosenberg -- and as reported by
GigaOm. Skype added 39 million registered users in the fourth quarter, while the number of Skype-to-Skype call minutes totaled 36.1
billion in the final three months of the year. What’s more, Skype users made more the 250 billion minutes worth of Skype-to-Skype calls from the time the service was launched
through the end of 2009. Furthermore, 36% of Skype-to-Skype calls as of the end of the fourth quarter included video, according to Rosenberg. According to TeleGeography Research, meanwhile, Skype
accounted for 12% of the world’s international calling minutes in ’09 -- a 50% increase over 2008 when it accounted for 8% of international calling.