Checking for brocken links

Would it be possible to be able to automatically check your book marks for broken links.
or to set an end date for a bookmark,sometimes there are thing i want to share or remember that are of the moment, but not really something i'd want to keep forever - like the billgates leaving talk on channel 9 for example i might watch it now, but in 6 months its old news.
 
happy I’m happy
Inappropriate?
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