@tommytrc won it with http://twitter.com/tommytrc/status/220161069958705152
There was one API retweet and 14 unofficial retweets: https://twitter.com/typertist/status/220268257163214849 https://twitter.com/JuliaRosien/status/220171309785690112 https://twitter.com/TarlovCyst/status/220252912251699200 https://twitter.com/joycecherrier/status/220220366088454144 https://twitter.com/level343/status/220201521369989123 https://twitter.com/mmangen/status/220186571012444161 https://twitter.com/SEOcopy/status/220185232802975745 https://twitter.com/arkarthick/status/220180186136719362 https://twitter.com/JohnLusher/status/220179206485712896 https://twitter.com/purplehayz/status/220174864634482692 https://twitter.com/JuliaRosien/status/220171309785690112 https://twitter.com/roncallari/status/220165178401099777 https://twitter.com/ShellyKramer/status/220162599696859136 https://twitter.com/SarahRobinson/status/220162544600485889
But @arkarthick's tweet was API retweeted once, brining the total to 16.
Looks like @tommytrc won fair and square, sorry.