Angry Birds is one of the fastest-growing online products I've seen, growing even faster than Skype, and the company has done a brilliant job of extending it across different platforms and merchandise.

We also have a conference call feature where up to five people can talk on one Skype call.

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

When we look at investing, we always think about 'how defensible is this, how likely is it that somebody is going to copy this.' E-commerce tends to be something easy to copy because it's execution.

If you can use a Web browser, you can use Skype.

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.

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