Does an Internet advertisement purchase personal browsing records?

The answer is no. Advertisers cannot purchase your browsing history.
Currently, only advertising service providers can access your browsing history on different websites. As far as I know, there are only two types of advertisers. However, no matter which type of Advertiser will sell your browsing history to advertisers.
One is an advertising service provider (such as Google Adsense/Baidu) of the Internet Alliance ). A large number of long-tail websites, including Redundant ad spaces for portal websites, will choose to use these online Alliance advertising fills. Once these sites are embedded with the code of a specific network alliance, the network alliance can obtain part of your browsing history by analyzing the cookies left by its partner website in your browser, because no network alliance can include all Internet sites ).
In this way, once you click or view a car model advertisement or page on the partner site A of a network alliance, the network alliance will record this visit, it may also tag you with a "car model". The next time you log on to another partner site of the network alliance, there will be an advertisement by an advertiser serving as a keyword. This is the simplest targeted serving method. Currently, the content and types of targeted serving are varied.
Although you can record some of your browsing history, current Advertisers use anonymous identity authentication (anonymous identifier, a string of random characters) to represent a single Internet visitor, that is to say, even if the network alliance detects your access records, it cannot associate you with these realities. At the same time, anonymous Identity Authentication relies entirely on cookies. Once you clear the cookie of the browser, change the browser, or use the optout option of the network alliance, the Network Alliance will not be able to identify you. That is to say, whether you are willing to be the target of targeting depends entirely on yourself. Therefore, your privacy is not at risk of leakage.
The second one is completely different. It is social networks such as Facebook and G +. At the earliest time, Facebook only advertised on its own website, and at the end of last year it began to advertise on its partner's site (Zynga ), the advertisement format is similar to Google pop-up window, but users can click the "like" button on the image directly. G + also began to allow advertisers to add G + buttons on Google's image display ads. This means that once you click the whatever button on these ads, Google and Fb know who is clicking the ad! Your profile, your friends, and all your information on social networks, unless you do not click this plus sign or like.
Theoretically, although the social network itself has a reason to grasp your identity information, no social network currently provides any form of optout options, it allows you to filter out the information that can be captured and the information that cannot be captured. This is indeed a little dangerous, and there are indeed negative cases. In 2010, the Advertising Service Provider repleaf obtained a large amount of user information from Facebook and sold it directly to advertisers (. Although social networks have cited this as a warning in the past, there may be more concealed ways to expose visitor privacy in the future.
I personally think that anonymous identity authentication is the baseline of the online advertising privacy policy. Users should have the right to choose whether they are used as targeting objects and whether their network data should be analyzed by anyone. On this benchmark, a loose one will result in disrespect for user privacy. However, if it is stricter, it is inevitable that Internet advertising is a very important ecosystem, the internet boom is largely supported.

Does an Internet advertisement purchase personal browsing records?