Just like real ‘families’, search engines have relationships too.
At the very heart of the worldwide search community lies the principal search agents – Google and Yahoo! who between them provide the bulk of all primary on-line search.
Information they harvest is supplied to various on-line search portals in the form of either organic (natural) results, paid results or both. The recipients can often provide information to others.
Add to the mix a whole load of meta-search engines (search engines that access and compile results from multiple search engines) – such as www.dogpile.com and www.metacrawler.com – and it all starts to get a bit complicated.
So who’s related to who?
Fortunately, an extremely useful schematic diagram is available from Bruce Clay, an established, US-based, online marketing company that describes in some detail the relationships between the ‘big players’ in global search along with a potted history.
Updated regularly, it provides a really good insight into how search data is propagated and shared amongst the main indexers.
Interestingly, as complex as the current chart might appear, it was a whole lot more complicated in years gone by. A neat ‘histogram’ device on the website makes it possible to wind the clock back as far as 2000 to compare the relationship charts over time.

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