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 many tweets are sent in 8 minutes as were sent on all of Election Day 2008. As of May 25, 2010, 48% of Obama's followers resided outside of the United States and 47% were female. At that time, the top five industries in which his followers were employed were Measuring social influence has become a new consulting career opportunity. According to discussants on the "PBS NewsHour", Obama has 5000 times as much social media influence as Romney; however, according to "The Hill", Obama only has 12 times as much social media influence. The official website of Barack Obama is barackobama.com.