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"The global search market continues to grow at an extraordinary rate, with both highly developed and emerging markets contributing to the strong growth worldwide," said Jack Flanagan, comScore executive vice president, who authored the report.. "Search is clearly becoming a more ubiquitous behavior among Internet users that drives navigation not only directly from search engines but also within sites and across networks. If you equate the advancement of search with the ability of humans to cultivate information, then the world is rapidly becoming a more knowledgeable ecosystem...
I'd say cause and effect flows the other direction. As search technology has become much more dependable, there's less reason to use bookmarks. I know that I rarely bookmark a site now, unless it was hard to find in the first place.
Again, according to the article, "About 87.8 MILLION searches originated on the Google Sites network". (global network?)
If true, Google has a search share of 6.27 %.
Me thinks this article is so badly written and researched it is not only useless but dangerous as people who clearly turned of their brain when reading jump to conclusions that are not justified by the (non-) content of this remarkable piece of 'state of the art journalism'.
<edited for typo>
Personally, I'd pin it on the death of bookmarks. In the time that I can scroll down or enter a search term into a bookmark field, I can find it in a search engine.
An alternative explanation is that as more and more people come online, the average web user is less and less web savvy and thus more likely to type 'yahoo' into google.com search box in order to get to Yahoo. Even that probably can't explain such a big increase.
Another factor might be that Google et. al. have become so good at indexing sites (while on site searches generally still leave much to be desired) that people have finally decided it's easier/faster/less frustrating to just try searching Google for what they want then going to example.com and searching for what they want.
I think the biggest, and most important, factor in why Search is expanding is because you don't HAVE to go to Google or Bing or Yahoo to perform a search, many sites offer a handy G Y or B search feature on site.
Allowing people to monetize on site search via adsense ensures the trend will continue.