The Flickr account has been closed down (usually for breach of Flickr's terms of service). Note that there are no 18 USC 2257 records demonstrating that the persons depicted were 18 or over. According to my understanding of US law, any Wikimedian who uploads or inserts such an image without having documentation of model age, name, and publication consent is in breach of US law; see discussion at http://meta.wikimedia.org/wiki/User_talk:Philippe_(WMF)#Implications_of_2257...
Andreas
Does it also apply to artwork of nude underages, such as http://commons.wikimedia.org/wiki/Category:Boy_playing_jonchets_by_Julien-Ch... or the trillion paintings with nude babies ?