A still from the Guardian's Webby Award-winning documentary on genital mutilation in Kenya
Social news reading app Flipboard for iPhone won both the judge's and the People's Voice Award, voted by the public, in the news for handheld devices category.
Bloomberg Businessweek and iPad-only title The Daily won awards in the news for tablets category.
The Guardian, a past winner, led the documentary category in the video section for its film 'I will never be cut': Kenyan girls fight back against genital mutilation.
Mashable was named best blog in the business category; the Huffington Post business section took the People's Voice Award in the same category.
Wired.com won in the magazine section, with the National Geographic voted for by the public.
The Webbys also saw a People's Voice Award for Al Jazeera English programme The Stream.
FactCheck.org won the best politics website, US satirical news site The Onion won five awards in total and ESPN.com was named best sports website.
The New Yorker site won best editorial, the best political blog was named by judges as the New York Times's FiveThirtyEight.
Pinterest took the judge's award for best in the social media category, Google+ was voted for by the public.
At a ceremony on 21 May, the judges will also honour Instagram, the photo-sharing start-up that was bought by Facebook in a $1 billion acquisition deal, as the "Webby breakout of the year".
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