The five most popular stories on CNN.com, according to NewsPulse.
Farmville, squared: Facebook, the world's largest social networking company, is providing each of its 500 million users with an @facebook.com e-mail address as part of a revamped messaging system that integrates with various types of communications.
Pat-down putdown: The Transportation Security Administration repeated Monday that everyone getting on a flight must be screened. The statement was in response to a video showing a California man in a dispute with airport security officials. The most powerful summation of the man's viewpoint is his saying, "If you touch my junk, I'll have you arrested."
This Old Corolla-sized House: Fuyuhito Moriya is 39. He still lives with his mother, but get this - in a house that's built on 30 square meters. That's the same as the size of a parking space for one car.
Petraeus warns Karzai over Afghanistan exit remarks: In what may be one of the most significant breaches between Afghan President Hamid Karzai and the Obama administration, Gen. David Petraeus personally warned Afghan officials over the weekend the U.S.-Afghan partnership could be "untenable" if Karzai wants U.S. troops out of Afghanistan prematurely.
Z's the hard way: The harder you “work” at trying to sleep, the more elusive those sweet dreams become, a sleep expert says. So how to get some quality shut-eye? Special glasses that block blue-spectrum light may be the ticket, because research has shown that light in that wavelength (450-490 nanometers) is the most potent stimulator of neurotransmitters that promote wakefulness.