A tool or platform to build multiuser newspaper-like site?

Need a clue, what tool would be the best for creating site with features:

• you see it as a newspaper, mean, set of articles to read (aka news reader)

• your view can have various content according to your preferences or perspectives aka: favorite authors, fav. subjects, etc.

• content (articles) is created by authors/users/members of site/platform

• there's a system of commenting articles

• there's a system of voting or giving marks to articles

• author may disallow other members for comments or vote

• author may remove comments found offensive

• there's a system of "gaining respect" and "grading" for articles and authors

• there's a system of feedback for a user containing inf. like:

  --> his articles with new comments --> his comments with new answers --> new articles form favorite authors --> new comments for observed articles

Possibility of inner messaging communication system would be a benefit.

If any CMS like Drupal Joomla WP than what extension. Any other tool? Built from scratch?