User Submitted Links

I can see a couple of different ways to try to tackle this.

1. Webform module. This allows you to create a formthat your users complete -- there area ton of different field types, etc., so you should be able to create a form in which the users submits a link and some comments, even a file (an image or screenshot, maybe?). Webform is an incredibly useful and powerful module -- and it works great when you want to gather information on the site in a way that will not be visible to other users.

2. If you want the submitted information to be visible to end users -- say you want a more robust version of comments to be attached to a node -- you may need to try something a little more complicated. You could replace the drupal comment system with a node type -- use cck to add whatever fields you want to the comment node type, then use views and either the block system or panels to display a view of those comment nodes on the page that they're responding to. It's a long way to go. Since you want to control whether those links become live or not, you could set up the default for the node type to be "unpublished" when it's first created, and only you can publish them once you're sure they're not evil.

3. There are some modules that will emulate some specific functionality, like the Support Ticketing System.