Cyberparenting and the Risk of T.M.I. It may be a timeless curse of parenthood to know simultaneously too much about one’s teenager and yet never access the information one actually wants. But the unruly morass of today’s social media and cellphone-infested landscape seems to have made both aspects of the curse worse. Nowadays, if you are the parent of a 14-year-old, you can see him guzzle beer, flirt with a girl who squeezes her bosom in every “selfie” she posts on Instagram, and describe a fellow ninth grader in language saltier than any you ever used at that age. Of course, your parents never even heard you swear. They had no idea where you went after you slammed the front door behind you. They couldn’t begin to fathom what you were really up to on a Saturday night.Today, parents are just one click away: buddied up on Facebook, logging on to Tumblr, peering over cryptic text messages and trying to get a glimpse of Snapchat images before they dissolve into the ether. Parents who