I keep getting cookies sent to me from adtmt.com, doubleclick, scorecardresearch, quantserve, chitka, vizu, and more sites. All of this is some sort of spyware, mostly for market research companies. I recently "erased and installed" my Mac, so I started over. I've only been to a few sites, all of which are legitimate (Yahoo, Facebook, Cnet, this site, and maybe CNN). I did, however, download "Little Snitch" from cnet.com, and Clamxav from their website. Clamxav is not finding any of this, nor did any of the other anti virus programs (Sophos, and iAntivirus) before I restarted my machine. How do I stop this? Are these sites really a big threat and can be ignored? I would really appreciate responses, as it is driving me nuts. Thanks!