Internet privacy: how to see what three huge data exchanges know about you

The New York Times revealed that three of the biggest online data exchanges, BlueKai, Bizo and Rapleaf will let you see what they think you like and let you delete that information. They also let you opt out of getting “interest-based” ads altogether. The Times article provided a link to BlueKai. I looked up the other two and created links to them as well. You're welcome.

Leave an (anonymous) comment after you do this, telling what you found (in general terms, of course.) Were you surprised?

If they don't have any or much data on you, tell us what privacy plugins/software or techniques you use. Thank you.