Do you need a 'community site' with drop-in modules for stuff like 'post this to Reddit/del.icio.us/YCnews' and 'upload a photo'? Drupal is good. Is it a cus

Do you need a 'community site' with drop-in modules for stuff like 'post this to Reddit/del.icio.us/YCnews' and 'upload a photo'? Drupal is good. Is it a custom application with tightly scoped, somewhat unique functionality? Then use something like Rails or Django. DO NOT attempt to use Rails/Radiant for a full CMS, or Drupal for a mostly-AJAX browser-based app. Trust me on this. You have been warned.