We have just started, and if you compare the number of people using Skype to the number using a telephone network around the world, we're still just starting.

It is very similar to companies like Google and other internet companies. When you go and search on Google you don't pay for that. But sometimes you click on an advert and Google makes money on that.

Skype is easy enough to use so that people don't need to be tech savvy - a lot of users just want to communicate with their friends and family, and they find this is the easiest, cheapest way.

When we started Skype, if you look at analyst reports, no one forecasted it as a big business. Also when Google started, it was not fashionable to be in search. It's not trying to do the obvious - that's the hard part.

Some Internet operators are concerned that video services such as Netflix and YouTube consume lots of the bandwidth on the network. While there is some truth to this, my guess is that the operators wished they could provide the same kind of services with the same success as Netflix and YouTube.

We have just started, and if you compare the number of people using Skype to the number using a telephone network around the world, we're still just starting.

With our work at Kazaa, we began seeing growing broadband connections and more powerful computers and more streaming multimedia, and we saw that the traditional way of communicating by phone no longer made a lot of sense.