A few weeks ago, a friend posted a “#carselfie” to Instagram. It was a beautiful photo — she peered up at the camera from under a beanie and looked positively radiant in the passenger seat of her car — and I duly “liked” it. “#Toogorgeous,” another friend wrote in a comment under the photo. She’s a stunning lady. But the photo, I learned later, was in fact “#toogorgeous” to be true: She’d had some digital work done. My friend, like millions of others online, had spruced up her selfie with Perfect365, a free app that lets people instantly smooth skin,