WHAT'S CHANGED: A playdate almost always has a digital element, whether it's stomping around to Just Dance 4 or passing the iPad playing Face Swap. “We like playing on my dad's iPhone or on my mom's iPod touch,” says Brenna, 6, of Ambridge, PA. Fave games for Brenna's pals include Flow Free, Cut the Rope, and the ubiquitous Angry Birds. Such competitive game apps encourage kids to interact and be good sports, says Eitan Schwarz, M.D., Parenting advisory board member and author of Kids, Parents, and Technology. “They help kids get a sense of identity and zero in on interests they can use to bond with friends,” he adds.
WHAT HASN'T: Shared interests (hamsters! soccer!) are the determining factors in kindergarten and first-grade friendships. The preschool mindset of “friends with…