Dustin Moskovitz, co-founder of social-networking site, Facebook Inc., announced he would leave the company in about a month. Mr. Moskovitz founded the social-networking Web site with Mark Zuckerberg, who is now Facebook's chief executive, while they were both students at Harvard University. Website membership was initially limited to Harvard students, but was expanded to other colleges in the Ivy League. It later expanded further to include any university student, then high school students, and, finally, to anyone aged 13 and over. The website currently has more than 100 million active users worldwide.

Dustin Moskovitz said he wants to move on by forming his own social networking company, along with Facebook engineer Justin Rosenstein, who joined Facebook after leaving Google.

Rosenstein notified in a statement on his Facebook profile that they hope to build software products which become as essential to users as Facebook is now. He added about the decision to leave the company: “Leaving Facebook makes me sad, but I feel I have to follow my passion on this.”

Facebook confirmed the rumor with a word from Mark Zuckerberg: "Dustin has always had Facebook's best interests at heart and will always be someone I turn to for advice."

The thing is that some other executives have left Facebook over the past 18 months, such as Owen van Natta, chief revenue officer and chief operations officer; Adam D'Angelo, its former chief technology officer; and Matt Cohler, vice president of product management.

In recent years, Moskowitz's role at the company was primarily behind-the-scenes. He was behind some public product debuts like the Facebook for BlackBerry application.