You shouldn't be afraid of failure - when something fails, you think, 'What did I learn from that experience? I can do better next time.' Then kill that project and move on to the next. Don't get disappointed.

Then people started using it more and more and it became the most downloaded software on the internet.

The next Google or Facebook will come from somewhere other than Silicon Valley.

When radio stations started playing music the record companies started suing radio stations. They thought now that people could listen to music for free, who would want to buy a record in a record shop? But I think we all agree that radio stations are good stuff.

They also can combine voice with instant messaging and online file sharing.

Surround yourself with smart, dedicated people - to build something isn't a one-man show. It's more important to have smart people who really believe in what you're doing than really experienced people who may not share your dream.

The telephone is a 100-year-old technology. It's time for a change. Charging for phone calls is something you did last century.