Boeing C-137 Stratoliner procurement of the Boeing 707 was very limited, amounting to three Model 707-153s designated VC-137A. When delivered in 1959 these had four 13,500 lb (6123 kg) dry thrust Pratt & Whitney J57 (JT3C6) turbojets; when subsequently re-engined with 18,000 lbf (80.1 kN) dry thrust TF33-P-5 (JT3D) turbofans they were redesignated VC-137B. Only one other variant served with the USAF: this was the VC-137C "Air Force One" presidential transport, the two examples of which were Model 707-320B Intercontinentals with specialized interior furnishings and advanced communications equipment. Two further non-presidential C-137C aircraft were later added. To supplement its VC-137s, the USAF converted
Barack Obama on social media Barack Obama on social media The topic of Barack Obama's usage of social media in his political campaigns, including podcasting, Twitter, Myspace, Facebook, and YouTube has been compared to the adoption of radio, television, MTV, and the Internet in slingshotting his presidential campaign to success and as thus has elicited much scholarly inquiry. In the 2008 presidential campaign, Obama had more "friends" on Facebook and Myspace and more "followers" on Twitter than his opponent John McCain. Obama's usage of the wider Internet has often since been compared to Franklin D. Roosevelt and John F. Kennedy's adaption of the radio and