Screen time can be a good thing or a bad thing, says Guernsey, describing the takeaway of a new report on the issue put out by the National Center for Infants, Toddlers, and Families. Deciding which is which comes down to how the screens are being used: interactive apps and ebooks, talking to grandma on Skype and looking through photos together? Great. Hours upon hours of endless television? Not so great. It's all about moderation and balance.