Child-friendly blogging app

Hi, I'm creating a website that allows registered users (which are not
is_staff) to write journals (text, images, sound, video, and uploaded
files), and write comments to other's journals. The journals and
comments have to be moderated by a different class of users (the
moderators) before they appear anywhere (not all moderators are
is_staff). The content editor used must be very simple and easy to use
because the users will be primarily children and teenagers (8-years and
up), and not all moderators will be technically knowledgeable (they are
teachers). Each user (children and moderator) are associated with a
"circle" and can only view and post contents within their own "circle"
(only is_staff user can publish content for site-wide publication). And
since some "circles" do not want to participate in this blogging
functionality, the whole journalling feature will be disabled for them.

Given these requirements, if you have any personal experiences with
using the existing blogging/CMS apps, can you recommend some existing
blog/CMS engine that will suit the requirement? Being easy to integrate
with other apps is a big plus (e.g. features like Django-CMS's Placeholder).

Easy-to-use content editor is a must, we do not want children to need to
learn markups or become confused when trying to use special characters,
e.g. <, >, &, but we do want basic formatting (also, some of the older
teenagers might know some funny stuffs like XSS, so good security is a
big plus).

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