Today, January 19th 2010, Bill Gates has created a personal twitter account. He has registered 5 hours ago and this was his first tweet:
@BillGates: “Hello World.” Hard at work on my foundation letter – publishing on 1/25.
about 5 hours ago
You can follow him here:
@BillGates (it is a Verified Account)
Bill Gates actually is following to 40 people, has 43,582 Followers, he is listed in 1,415 lists and just wrote 4 Tweets (it is just his first day).
I have the feeling that this numbers will keep on growing now that I have mentioned it in Aeromental 
