document: The indexable web is more than 11.5 billion pages In this short paper we estimate the size of the public indexable web at 11.5 billion pages . We also estimate the overlap and the index size of Google , MSN , Ask\/Teoma and Yahoo !
doc_bio_tags: O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O