It's definitely a people problem more than it is a technology one. I don't think a direct social networking approach is right. Consider the following: If your

It's definitely a people problem more than it is a technology one. I don't think a direct social networking approach is right. Consider the following: If your friends' idea of a meal requires pizza and Coke(and not that "pussy diet stuff"), you are likely either to join in with them, or stop being friends. They've already formed a supportive network around bad habits, and if one member tries to introduce technology with the intention of changing the habits, they'll get ostracized. So what you are really in, if you are aiming to help the most at-risk people, is the business of propaganda. The people who have overcome the social hurdles already have plenty of resources.