Tip - How Can I Help My Kids Develop Better Social Skills?

Dear Lifehacker, I want my kids to grow into happy, well-adjusted adults. When it comes to social skills, though, I'm at a loss. One of my kids seems lonely yet disinterested in others, while the other is the terror of the schoolyard. What can I do to help them develop the social skills they need for life?
Tags: ask lifehacker, parenting, social skills, social gps, kids, etiquette, communication, Lifehacker