Far more rare, however, is a privacy concern involving Facebook's own founder.
Just a couple of weeks ago, Facebook CEO Mark Zuckerberg made headlines when his personal Facebook fan page fell under the control of a hacker. Now, Zuck says someone is using his own social network to stalk him -- in a literal and rather unsettling sense.
Mark Zuckerberg's Stalker Investigation
Facebook has confirmed that Zuckerberg recently filed a stalking-related restraining order against a man in California. Court records indicate that man is a 31-year-old named Pradeep Manukonda.
According to TMZ, Manukonda repeatedly attempted to contact Zuckerberg, both via Facebook and in person -- and reached out to his girlfriend and sister, too. Manukonda is accused of going to Facebook's offices and even Zuckerberg's home to try to see the high-profile tech exec. Some sources say he attempted to reach Zuckerberg as many as 20 times in a single day.
One message said to have been written by Manukonda begs for Zuckerberg's attention. "I really need your help," the message, published by TMZ, proclaims. "Please respond in time...before it is too late for us."
Manukonda reportedly received a verbal warning from police in January but continued to contact Zuckerberg nevertheless.
Zuckerberg's Alleged Stalker: What We Know