In Skype where it says 15,279,670 people on line, how do they distribute that data.<p>Do you think it's distributed peer-peer or do you think every client does a lookup to skype.com every 10 minutes or so?<p>If all 15 million clients are doing a lookup to skype.com every 10 minutes that's a maximum possibility of 2160,000,000 requests a day...<p>But even if it's only a fraction of that it's a serious amount of requests just to distribute a number!