Astroturfing is a term for formal public relations campaigns in politics and advertising that seek to create the impression of being spontaneous, grassroots behaviour. Hence the reference to AstroTurf (artificial grass) is a metaphor to indicate fake gras
retrievr is an experimental service which lets you search and explore in a selection of Flickr images by drawing a rough sketch. Currently the index contains many of Flickr's most interesting images. If you'd like to have your images (or the images for a