Corrections & Clarifications
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"Censorship: The Trade Barrier That Dare Not Speak Its Name" (Politics & Policy, Mar. 14 - Mar. 20) should have said that Google diverted its Chinese-language search traffic to Hong Kong in 2010, not 2009.
In "Is DoubleClick Clicking for Google?" (Technology, Mar. 14-Mar. 20), the implication that DoubleClick had abandoned the use of cookies before being acquired by Google is incorrect.