As some districts ban the use of social media in and out of classrooms, and others encourage its use, how do you explain such polar viewpoints?

I currently work in a school district that has very strict policies in place about social media and its place in our schools. Our district all but forbids the use of social media as it has been used in a negative way. However, I feel that in order for the district to move forward in such a technology based era we must revisit these policies. I believe the use of social media in and out of the classroom is very beneficial ways of communicating with students, parents, and the community. It is also a good way to share best practices as well as network. I believe that those who do not want social media used lack a basic understanding of how to utilize these tools so that they can be positive and beneficial.