Rob one approach to control is by network segment. Those with certain clearance are one one network segment (set of IP addresses) and those with tighter clearance are on a different network or network segment.Those who have higher clearance can easily read the information from lower levels, but it is more difficult for those people to share to those with lower clearance. Most of the activity will likely be in the more open levels, as there are more people there. [This is from group that needs privacy and security and prides itself on it, but has a very robust and large social sharing community].Other options are through software that allows for sharing with in select groups with permissions built in. This often hinders sharing for a breadth of benefit. It also lends itself to bottle necksHow open an organization is to sharing is often where to start with thinking about potential solutions. At times there are very valid reason for walled garden sharing (this can include government regulation/laws, contractual reasons (work for competitors), and/or internal competition. Saying that there is often far less need for limited sharing than is believed by most upper management.Often sharing inside organizations is a concern with leaked information outside or information getting in the “wrong” hands. Since most solutions have identity, based on pseudo names but real names, transparency is increased and people are held accountable for what they do. The whole organization is just watching. Once people realize what is openly shared is something they are accountable for, they take it seriously. Having good policies in place is a good step as well, most often the policies are very similar to existing organization e-mail policies.