I've written before about the experience of free play and letting our children explore beyond the walls of their own home. It's important for social language development to have experiences interacting with other children and adults outside your immediate family. Every time we hear a new story about kids getting hurt, however, it's hard to trust that children are safe exploring the world. I thought this article gave some nice advice on how to make that bridge with your child.
Parenting After Penn State: Can We Trust Coaches with Our Kids? http://healthland.time.com/2011/11/10/penn-st-scandal-how-parents-can-talk-to-their-kids-about-sex-abuse/