Was the first president of Facebook a co-founder of the company?

No, the first president of Facebook, Sean Parker, was not a co-founder of the company.

Facebook's official co-founders are Mark Zuckerberg, Eduardo Saverin, Dustin Moskovitz, and Chris Hughes. 

Sean Parker joined Facebook later in 2004 as the first president, playing a significant role in the company's early growth but not being part of the original founding group.

No, Sean Parker was not a co-founder of Facebook. The company was founded by Mark Zuckerberg, along with his college roommates Andrew McCollum, Eduardo Saverin, Chris Hughes, and Dustin Moskovitz. Sean Parker became involved with Facebook in its early days as an advisor and investor, and he later joined the company as its first president. While Parker played a significant role in shaping Facebook's early growth and development, he was not one of the original founders.