Avi Rappoport did an excellent post on search log junk. This is the set of queries that aren’t very useful  when you’re analyzing search logs, mostly from crawlers, hackers and spammers. We see a lot of these types of queries and constantly trying to block them and remove them from our reporting – so we can extract useful information. I hadn’t seen anyone talking about this before – but it is something else you need to be aware of when you’re trying to extract the valuable information that is in search logs.