Temperature is a physical quantity expressing the subjective perceptions of hot and cold. Temperature is measured with a thermometer, historically calibrated in various temperature scales and units of measurement.
The most prominent owner of Facebook, Mark Zuckerberg (24% of the company), was born on May 14, 1984. This makes him 26 years old as of July 2010.
Using the construction we usually use in the valley, Mark Zuckerberg is the founder of Facebook. He built the initial site by himself, and then the others joined in, but were always clearly below him in the hierarchy.