[Zope] Newbie question about Zope functions

We're trying to pick the right open-source platform to build an online community site. Needs are a bulletin board, a blogging capability, and a good permissioning system (users will be members of groups and some pages will be accessible to everyone, but some limited to members of one group or another). Would Zope be a good fit for this? Any examples of Zope sites built with this functionality appreciated. Thanks for any illumination. Beverly (I didn't see a bboard on the zope.org site itself, so maybe Zope's strong points are in content management, rather than these community functions?)