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 television mediums respectively in the history of communication between the White House and the American Public. Barack Obama's Twitter account (@BarackObama) is the official account on social networking site Twitter for former President of the United States Barack Obama, and has been used for his election efforts. Obama also used the White House's Twitter account (@WhiteHouse) for his presidential activities. , Obama's account had 103,083,062 followers, followed 617,962 accounts, and had posted 15,548 tweets. Well into 2011, it was following the most people of any account on the network and was the third to achieve ten million followers. It is