Answer:
Big Brother is the longest running Reality show as of 2012.
It has telecast 1027 episodes excluding 203 celebrity episodes up till July 2011.
The show will continue until the end of 2014 as per Channel 5 announcement.
It was originally broadcast on Channel 4 from 18 July 2000 onwards.
Article : Reality Shows - Facts and Effects
Next Question: Which is the first baseball movie?
Previous Question: Which was Sylvester Stallone's first movie?