And that limits the utility of any search.

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In a culture that encourages the constant search for the limits of human achievement, we, the fans, the consumers of popular sports entertainment, revel in record-breaking, gravity-defying, barely believable feats on the field of play.

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Separate from Graph Search, Facebook already limits some content posted by minors to "Friends of Friends" only, even if the young user has made it public.

CNN: Doug Gross,

The search will continue until the four are found or until the limits of survivability have passed, he said.

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Alleviating fears that authorities might "search" the sample for unauthorized purposes, Ferrara said state law limits the use of the sample to law enforcement purposes.

CNN: graphic