Well, I can't believe I'm on Twitter: https://twitter.com/alan_winfield

Not at all sure I understand what I'm doing yet. There' some puzzling terminology to learn - what's retweeting for instance..? (It sounds like a word from The Meaning of Liff.)

The reason I joined is because I wanted to respond to the questions on @scienceexchange. The first question is

Given the rate of discovery of exo-planets - is there still any doubt that we are not alone in the universe?

And my twittered answer:

Depends: life maybe a little more probable; intelligent life still highly improbable, see Drake's equation

I like the challenge of trying to construct a useful answer in 140 characters.