Marissa Mayer: Twitter is Complementary to Google [Video]

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On Twitter, Mayer makes a calculated response: "Things show up there first. And so we definitely think that including that in the world's information, hopefully being able to search that and surface that for our users, with all those realtime updates coming in, is something that could complement our search engine for those types of queries."

Of course, Google can't make full use of the linking data contained in Tweets, since those links use the "nofollow" attribute...for now.