I have been using linked in to build global relationships. This is a great medium for connecting with people and exploring business opportunities. However, individual group managers of linked in designated groups are often a bottleneck in networking. Posts aimed to invite collaborating companies are shifted to the job section where they should not be. On the other hand, you will see large numbers of frivolous posts on the discussion forums. Most of these are from placement agents, networkers seeking to connect with anyone.
I think there is a need to regulate linked in better. This could be in the form of defining rules for each of the group managers to follow, curtailing the roles of group managers and restricting these to use of things like offensive language etc.
The popularity of social networking site is the freedom that these provide to people. This voice of freedom should not be permitted to extinguish.