6.6% of USA population?

I read the following statement of Peter Parkes, a Skype official blogger, on the Skype Blog:
"Skype reached its 20 millionth registered user in North America!"

As usual, let me correct this statement: they mean “registered user names”, not "registered users", and this isn't equal to "active users", see my explanation here in Skype Journal and on some of my previous posts!

Let us assume the numbers are however correct, this would mean that:

• 8 % of the active Worldwide Skypers are from the USA
• 6.6 % of the USA population are Skypers
• 10 % of the “active” population of the USA are Skypers (discounting people older than 65 years, and younger than 14 years)
• 8.6% of USA internet users are Skypers (not 10% like stated on the Skype blog!)

Bear in mind that the second, third and fourth numbers above are very exaggerated, and you can read why there are less active users than registered user names in my "Japanese blogpost"! I would like to add one reason to these:

• Spammers also register multiple usernames to "attack" their victims
  

So, like always, this 20 million users statement is marketing exaggeration!