skype

i've reinstalled skype on my laptop, needing a stable and cheap (well, free) way to make long-distant calls. had never installed the current version, and when i did, the software didn't ask me for any previous account, any e-mail address, any name or password, nothing. it just logged in...

... and displayed my name and a real-life friend in my contact list. this is creepy: how the hell did skype know that?