
On Friday, not only did the iPhone 5s and iPhone 5c become available for the public to purchase, but Apple CEO Tim Cook also said his first few words on his newly created Twitter account.
Cook, along with other Apple executives, were present at multiple Apple Store locations on Friday to meet the customers of their products. Cook's first words on Twitter pertain to that:

We welcome Mr. Cook to Twitter and look forward to hearing from him. If you want to follow our favorite CEO on Twitter, you can find him at this link.
Sources: Tim Cook
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