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Aggregation and duplicate content are two different things.
Dup content penalties usually arise for similar pages on a same domain containing the same content. Back in the days, spammers would create hundreds of pages of the same content in order to flood the SERPS with their results.
It also happens to sites that copy entire pages of content from another site and post it on theirs (example : article directories).
Aggregation is completelty acceptable in the eyes of Search Engines. Look at techcrunch and other famous aggregators.
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