Along with Facebook’s current CEO Mark Zuckerberg, Dustin Moskovitz founded the social networking site Facebook while he and Zuckerberg were both students at Harvard.

Now, Dustin Moskovitz says he’s leaving the company by the end of the month, moving on to form his own social networking company, along with Facebook engineer Justin Rosenstein, who joined Facebook after leaving Google.

Although not stating it directly, Moskovitz has implied that his reason for leaving was that Facebook was starting to look less like the start-up college project that he and Zuckerberg built on idealism more than anything, and more like the corporate power players of Silicon Valley. He and Zuckerberg parted on friendly terms however, with the Facebook CEO stating that "Dustin has always had Facebook's best interest at heart and will always be someone I turn to for advice.”

Moskovitz and Rosenstein say they have been working on software intended for business users, and had intended to include this in Facebook’s functionality, but decided against it, Moskovitz arguing that "at some point it became clear that doing so wouldn't be good for Facebook or for us." He went on to say that he saw their software rather as complementary to Facebook.

They’ve not been the only ones to leave Facebook recently, as during the past 18 months, several other executives have left Facebook, among them chief revenue officer and chief operations officer Owen van Natta; chief technology officer Adam D’Angelo and vice-president of product management Matt Cohler.