Closeups of our faces, cocked just at the right angle with our lips pursed and our sultry gazes directed at the camera, are our prized social media possessions. Why? What is it about the selfie that makes it such a popular everyday habit among social media users?

Heidi Montag, reality show star turned plastic surgery spectacle, has gone under the knife again -- this time, for medical reasons. The 27-year-old former "Hills" star reportedly underwent a breast reduction that decreased her bra size from an "F" to a "D."