Web search engines employ many filters to deliver the bubble of information that they think will please information consumers. Information professionals struggle to get out of those bubbles. Their mission is to find all sides of an issue, to research every aspect whether or not they like the answers they find. That's where walled gardens come in. The author is thinking of walled gardens as the premium services libraries and information professionals enjoy as subscription items, such as Factiva, Dialog, EBSCO, LexisNexis, and ProQuest. They are unlocked only when you know the requisite user ID and password. Information walled gardens can be expensive to cultivate -- hence the need for subscriptions.
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