I was wondering what it really means that wordtracker gets stats from metacrawler and dogpile. Those 2 engines compile findresults from a host of SE's together. I understand that this data goes into the wordtracker database. But what about all the searches conducted DIRECTLY on all those SE's? Are those somehow also included into wordtrackers services ? Gdev
Google, for example, doesn't share its numbers with others. So estimates are created by extrapolating from dogpile and metacrawler results. LOTS of assumptions involved.