Lesson number one: opportunity can be manufactured. Yes, you can wait around for the right set of circumstances to fall into place and then leap into action but you can also create those set of circumstances on your own. In so doing, you manufacture your own opportunities. This has helped me immeasurably.

You curate information that you want to receive. It's a lot different because I'm not asking you if it's okay, I'm just saying I'm following your updates. That's why I don't think of Twitter as a social network.

There's a lot of social input when you put these things out there. People's ideas cross with other people's thoughts.

Both my wife and I have a lot of compassion for animals in general.

When you think of a social network, you have these two-way interactions: "Are you my friend? Yes? No? Yes?" Like LinkedIn, it's business oriented, but it's all about establishing connections. You connect to me through my other connections, and that sort of thing, and you sort of define who your friends are. Twitter doesn't have that.

Constraint inspires creativity

You have to think for an email. What's the subject? What's it about? It takes two seconds to think about that. So you have to think, Is this a work thing or a social thing? Which? Then you get into a situation that you don't want to be in, because then people are thinking about it too much.