Note on permissions inheritance
Warning!
Converting an existing site to a community causes inheritance of permissions, if in use, to be broken.
Every community is created with unique permissions - community sites, by default, do not inherit permissions from their parents.
This is done because otherwise, users who are members of the top-level site in a site collection would be automatically made to follow every community created in the site collection.
As a consequence, any existing site that inherits permissions from its parent that is then converted to a community by activating the NewsGator Community Web site feature has that permissions inheritance broken.
Administrators can manually re-establish permissions inheritance in such cases, if desired.