When I create a group in JAM I can specify if this is a company specific group or a cross company group. I can also specify if group members can invite others to join the group. For company-confidential work, I pick the 'company specific group' option while allowing any group member to invite other SAP colleagues to the group. This improves the agility of the team and keeps it nimble. At the same time, it also restricts the members from accidentally inviting people outside the company to the group.
This feature helps me ensure that there is enough freedom and openness in the work group while confidential information is not leaked outside the company.
Many partners and customers reached out to me and said that they are not familiar with JAM. JAM is a free product. You can start using it here.