The next graph represents the number of concurrent Skype users online on September 09, 2013.
The fluctuations are mainly due to day and night usage of the users in the different time zones. In 2008 I tried to explain the shape of the curve, see my post.
But, what surprised me is the following fact: Monday is usually the peak day in users online, but after the “false outlook induced growth” of end of August we had a quite significant downward trend (rounded numbers):
- Monday, September 09: 62 million
- Tuesday, September 17: 62 million
- Monday, September 23: 58 million
- Monday, September 30: 58 million
Skype growth stopped? Or still adjustments due to the Outlook.com integration?