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Listen to the podcast: Are you being
tracked online?. 
Transcript
This is Leo Notenboom for askleo.info.
This week there was news of a movement to create a "do not track" registry for the internet, much like the "do not call" registry.
Yep, big brother may not be tracking you, but it's likely that Madison Avenue is.
Most people don't realize how much their online activities are being tracked by retailers and advertisers. Most don't think about it, and those that do typically have a serious and often paranoid misconception about exactly what's happening.
For example a retail store might place your customer number in a cookie on your machine so that the next time you visit the site automatically receives that cookie and knows who you are.
Advertisers can also place so-called "third party" cookies on your machine. Since the same advertiser may be displaying ads on thousands of websites they can track where you go across those sites, even the sites you've never been to before.
So here comes the paranoia: "Oh my God, you mean advertisers are tracking ME?"
Well, yes ... but no.
They're likely not interested in you as a specific individual. There are simply too many people for them to bother tracking anyone specifically. Advertisers are interested in crowds of people, and they collect or "aggregate" the data to see what trends those crowds are following. For example, if half of the people that visit Joe's on-line book store also visit Mary's on-line grocer, that's very interesting data that might be used to tailor specific or more relevant offers to that crowd.
If you're one of the people in that crowd ... well, your identity is likely just lost in the noise.
Amazon.com does this kind of thing within their store all the time. They track what you've purchased and even what you've just looked at, so as to make suggestions of other merchandise that might appeal to you.
Most advertiser tracking is really not much more than the same thing, only with less accuracy, applied to larger groups of people, and across a broader range of sites. Sites may not know who you are, but they may be able to better target what they offer you based on the characteristics of the kinds of crowds you appear via tracking to belong to.
Yes, you can disable cookies, but then a bunch of sites stop working completely. You can disable the third party cookies in most browsers if you like, but there are apparently ways around this that allow the same kinds of information to still be collected.
This isn't to say we shouldn't be watchful, we should. This type of tracking data could be abused. That's one reason I actually do business on-line with a handful of companies that I trust.
But in the long run, with a little bit of common sense, I'm just not that concerned.
I'd love to hear what you think. Visit askleo.info and enter 11964 in the go to article number box to access the show notes, the transcript and to leave me a comment. While you're there, browse the hundreds of technical questions and answers on the site.
Till next time, I'm Leo Notenboom, for askleo.info.
Related:
Article C3201 - November 3, 2007
I no longer allow CCleaner or other programs to clean out cookies. As long as everything is working OK it is just too much bother to start all over every month putting in my information in order to get another cookie. They are more useful than most users realize.
Posted by: terry coon at November 10, 2007 10:08 PMI am currently not concerned with tracking, however it has been revealed that that government tracks personal phone calls and other private matters in the USA. With the co-operation of the ISPs, this can become a dangerous practice.
Posted by: Tom at November 11, 2007 3:42 AMLeo, you stated "...but there are apparently ways around this that allow the same kinds of information to still be collected." What are the techniques used? Or what do you think they are using?
Posted by: Chuck Newman at November 13, 2007 7:37 AM-----BEGIN PGP SIGNED MESSAGE-----
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I've only heard it as a passing reference, but what I heard had to do with
advertiser-specific subdomains off of the parent domain. So something like
ads.somesite.com would still be allowed to place and fetch cookied information
if you allow somesite.com. As I said, my understanding is incomplete here.
Leo
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Posted by: Leo A. Notenboom at November 13, 2007 1:53 PMejmUsDqXqkSV6m3tqqqlQ5w=
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If I get a cookie while using Internet Explorer will it track the browsing that I do on my Firefox browser and vice-versa?
Posted by: Aaron Childs at January 30, 2008 12:11 PM-----BEGIN PGP SIGNED MESSAGE-----
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Nope. The browsers keep separate cookie collections.
Leo
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Posted by: Leo A. Notenboom at February 2, 2008 11:41 AMT9g6DZ+4m3PAEasbPzuQT/Q=
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I went into Explorer/Tools/Internet Options/Privacy/Sites and found a lot of advertisers listed in the "blocked" box, several of them are in Cookies, so that means blocking these cookies is not working! I can't get rid of ad.yieldmanager, it keeps coming back. I went in Internet Options and blocked third party cookies and with first party cookies checked the "prompt" box. Now, I am getting so many messages asking me if I want to allow a Cookie, I check the "block" option and it takes clicking on that 3 or 4 times before the message disappears....
Posted by: Willa Cunningham at February 20, 2009 7:10 PMI am horrified to see that an unpublished court record of a case that was dismissed, and that I was part of years ago and withdrew from has been published for all to see when my name is searched. Most of the other claimants are not. I was not even the originator of the case. Who put this infomation under my name? Why am I being tracked? How can I have this removed? This is not done to child molesters. Can you Google their name and it says CHILD MOLESTER? I think not. Is there something I can do about this? It is as if this is something personal against me and the internet is furnishing a voice against the powerless. HELP!
Posted by: alice at October 27, 2009 8:51 AMI believe 'trackmenot' add on doesn't work.Gzapper 1.45 may,but to get to most sites you need to 'restore the cookie'.As google wants to track you.Vidalia/tor/privoxy does work,but to write comments on Mininova,you need to restore the cookie'as they ban you 'masked' IP address.Most other IP hiders DO NOT work.'Ninjaproxy' is ok,but an ad box may keep coming up,and it leaves some history in index.dat analyzer.
Posted by: thevermin8tor at November 10, 2009 12:05 AMAnalogX Cookiewall is good,when IE or Mozilla and other cookie culling software lets some slip through,so you must delete any new entries caught within it.
Posted by: thevermin8tor at November 10, 2009 12:11 AM