Apple CEO Tim Cook has sent his first tweet since joining Twitter. Cook sent the tweet on 20 September, to coincide with the release of the iPhone 5s and iPhone 5c. He wrote: "Visited Retail Stores in Palo Alto today. Seeing so many happy customers reminds us of why we do what we do." Cook, who's Twitter account has been verified, already has more than 221,000 followers. His first tweet was retweeted more than 8,000 times and favourited by more than 4,000 Twitter users. Visited Retail Stores in Palo Alto today. Seeing so many happy customers reminds us of why we do what we do. — Tim Cook (@tim_cook) September 20, 2013
