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This is a kind of checking that I assign to a human being -- just going on a clicking rampage through the links. Anything that looks different from what the link description says gets the boot. The bad ones usually jump out at you, unless your original link collection was rather indiscriminate. It doens't take too long, and the eyes-on part is important. You can catch bad links even before Google hits the domain in question and it is better to be preemptive.