DoubleClick in Full Retreat: "DoubleClick has never and will never use sensitive online data in our profiles, and it is DoubleClick's policy to only merge personally identifiable information with non-personally identifiable information for profiling, after providing clear notice and choice," Wondering why this apparent change of heart? DoubleClick shares fell more than 12 percent on Thursday morning to a low of 92-7/8, before recovering slightly to 94-1/8, down 12-3/8. The shares were the biggest net loser on Nasdaq. Follow the $$$.