Barack Obama: "Rest in peace, Steve Jobs. From all of us at #Obama2012, thank you for the work you make possible every day-including ours." Bill Gates: "For those of us lucky enough to get to work with Steve, it's been an insanely great honor. I will miss Steve immensely." Mark Zuckerberg: "Steve, thank you for being a mentor and a friend. Thanks for showing that what you build can change the world. I will miss you." Paris Hilton: "So sad ...