Userscripts.org

I do not know how this script works, but I was wondering if it could be adapted to work in a facebook group?
I am in a few Age Of Champions facebook groups. Most raids are completed in under 10 hours, but there are days of old posts that remain.
Maybe have it look for a common part of links, like "&raid_instance_id="

a common link looks like:
http://apps.facebook.com/ageofchampions/?source...
or
http://www.ageofchampions.com/game/?source=210&...

I would suggest using Social Fixer for this purpose. You can customize the filter to look for specific words in the post. I recommend having it place the results in a separate tab until you are certain you have it set up to isolate exactly what you want before setting a different action on the filter.

Try it, I think you'll like it!

http://www.socialfixer.com