Facebook

Facebook executives and senior staffers have been saying goodbye to the social network at a speedy rate ever since its May 2012 initial public offering.

In the past few days alone, head U.S. sales guy Tom Arrix and Gowalla co-founder Josh Williams have said they're headed for the exits. Sure, Facebook, with 4,900 employees, should be forgiven for some expected turnover, but when the top brass bow out in successive fashion, some without rhyme or reason, you can safely bet that it's not all sunshine and rainbows inside the world's largest social network.

And, of course, there are the ostensible clouds hanging over the company's stock, which has been in a major slump in the past six months.

With its IPO behind it and investors demanding more revenue, Facebook has lost its sexy ingenue status, which means its hacker and entrepreneur-minded staffers are likely ready for their next challenge -- or their next big paycheck.

What follows are some of the most notable departures in the past year.