twitter micro-blogging social

Many times I've scratched my head at Drupal why I couldn't create a simple micro-blogging site. All the ingredients and modules are there, such as, Views, Rules, Flag, User management modules, CCK, Content Types. Yet one part was failing, which goes to the core of micro-blogging, to only list content of users you choose to follow. You can flag users, but you can not yet filter content to only list the nodes of the user you flagged.