According to computer security firm AVG, 73% of kids under the age of 2 have an online presence of some kind. Obviously these aren’t child geniuses who have figured out how to bypass the Windows login window, but insipid new parents who think it’s cute that their toddler has an email address. Additionally, 5% of kids have a social networking profile somewhere. AVG says it’s important that parents understand the implications of posting their children’s most private pictures and data online, other than the problem of being extremely annoying. “First of all, you are creating a digital history for…