The FAQ says: How many subgroups can I be a member of at one time? 50. How is it possible to get 51 groups? https://www.linkedin.com/anet?dispSortAnets=&trk=my_groups-h_gn-settings :
In LinkedIn Groups, is it possible to allow all members to approve pending membership requests? Facebook has this feature and it is a great boon to group membership for restricted-entry communities ...