On Wed, May 8, 2013 at 12:21 PM, George Tsirigotakis
<tsirigotakis.george(a)gmail.com> wrote:
1. Is it possible for the members of my community
to use the MediaWiki
page without to register again?
Yes, you can write an AuthPlugin for MediaWiki to plug in your own
custom authorization/authentication system. See [0].
2. Is it possible articles and updates from the
MediaWiki page to be
shown on the members' "wall" and/or activity feed?
This sounds like a job for the API[1].
-Chad
[0]
https://www.mediawiki.org/wiki/AuthPlugin
[1]
https://www.mediawiki.org/wiki/API:Main_page