Warren Buffett 'is in the house' and on Twitter

The world's most famous investor, Warren Buffett has signed up to Twitter and sent his first tweet. When asked if he understood how the site worked he said: "so so". Here's what the 82-year-old tweeted.

His account notched up more than 10,000 followers in the first 10 minutes. Buffett's digital debut came during a live webcast. And he's already received a reply from one of the world's richest people, Microsoft co-founder Bill Gates.