We need some kind of module that would traverse the stories data table looking for broken bookmarks back to the originating story. This would reduce the number of 'broken' links when Pligg is being used as a bookmarking site.
My thoughts are the module should start from the oldest post (most likely to be, broken, deleted or 'out of date'), run from a cron or pseudo-cron trigger/task and check a configurable number of posts, keep track of it's last checked story and continue from there on each successive cron trigger..
The module should be configurable to either place a failed story into 'upcoming', moderation, discard or else do nothing but email the admin with a link to the story..
The action should also be configurable for counts of failed check attempts as the referenced server downtime could cause a false trigger.