Policy development is an important area which you hint at above (under non-profit admin and management).Certainly the forum is an international community, if you are aiming for the advocacy to be similarly international then you will need a suitable focus and maybe an advisory board covering all the major countries/regions (eg US, UK, Canada, Europe, Australasia and 'other')
In the media space I think you need proofreaders and possibly fact checkers and copy writers as well..
OTH