 This allowed some users to be identified by their search queries, prominently a woman named Thelma Arnold.On August 4, 2006, AOL Research, headed by Dr. Abdur Chowdhury, released a compressed text file on one of its websites containing twenty million search keywords for over 650,000 users over a 3-month period intended for research purposes.AOL deleted the search data on their site by August 7, but not before it had been mirrored and distributed on the Internet.