And we thought Facebook was big...

Skype now has 521 million users, a 41% increase over the previous quarter (April-June '09), TechCrunch reports. "That’s a stunning 40 million new registered users in the past three months," it adds. This is not just Internet telephony used for free or incredibly on the cheap by people all over the world. Oprah uses Skype all the time for and on her TV show. Here's her page explaining (and promoting) it – Skype has become one of her sponsors. As for us regular people, TechCrunch continues: "Free Skype-to-Skype minutes grew 74% to 27.7 billion minutes [this past quarter], whereas SkypeOut minutes (which is what members pay for) grew 44% to 3.1 billion minutes."