Did a quick search for similar, sorry if I duped.
Feature suggest for any SE site:
- run a cron task...
- that checks all posted links for dead-ness...
- using methods suggested here or elsewhere
- if link is dead
strike it outor similar
- (optional) notify poster of link
- (optional) if post/comment containing the dead link has 50% link chars (i.e. the post/comment is mostly the link), the flag for deletion