In some of our communities we have to give external partners access to the data but there are three reasons why we do not wish them to see the member-list and data of the other external members of the community:
1) some external member do not wish to have that data shared because of their privacy (related to their job or social status)
2) we have some communities where the participation and the content produced will be influenced (and thus changed) when other external users know hown is participating from outside our company
3) we used Connections Social Clouds as a dataroom for bids. Thusfar we do this by manually creating fancy users and linking them outside the system in an Excel-sheet. This is a lot of extra work and this way we can't use the communication options of IBM Connections to keep the external members informed.