Researchers are turning their attention towards the negative side of social capital. If you were to peruse the literature you undoubtedly come up with more studies of how social capital helps us in our lives than you would find how it hurts us.
However, it's important to remember that not all social capital is good. I can think of gangs, poor attitude of students and many others than impact people's lives negatively. It's important to promote positive relationship development in our child's lives and this is why we have to be careful with online social networking websites. Discuss with your children why they are visiting these sites. Research is showing that if they have a purpose for visiting these site the less likely to get in trouble.