II. Privacy
Most individuals probably do not fully appreciate the amount of their personal information that is available
online, how it may be used, or the degree to which it may be misused. The Internet has brought with it an
explosion of accessible data, including personal data. Governmental agencies responsible for
professional and occupational licensing may now have websites with membership lists, complaints filed,
and disciplinary actions taken. A simple browser search can turn up much more information from the
public pages of social media sites, both self-disclosed and posted by friends, family, and acquaintances.
III. Data Mining
Data mining is the process of building individual profiles of individuals by organizing all the disparate
pieces of information collected in the normal course of business. Significant efficiencies can be achieved
from the use of mined data, but there are downsides as well. Personalized responses can also permit
price discrimination. If the algorithm concludes a user is likely to be a shopaholic or financially
overextended, payday lender ads may start appearing on the screen. Not only are many users not aware
of the extent of personalization occurring, but even if they are, there is no process for correcting these
hidden profiles that influence one’s online experience nor right to delete them.
A. Cross-Device Tracking
Instead of one vendor, consider for a moment the source of the user-specific data available to certain
iconic Internet businesses, such as Facebook, Google, Apple, and Microsoft. When they have finished,
they leave the site. If the users also own a smartphone, they may also use it to access Facebook and
have it running as they travel through their day. Google, Apple, and Microsoft can also do cross-device
tracking—Google by connecting its users through Google Plus, whether they are on its Chrome
browser, Google search, Gmail, Google maps, or its phones; Apple among its phones, its iPads, and
laptops running its Safari browser, and its app stores; and Microsoft through its browsers, MSN,
Hotmail, Outlook.com, Xbox, phones, and Bing. These companies are not only tracking across
devices, but also across many different platforms.
B. Aggregators
An aggregator in this context is any person who takes data that are discrete at the level of the
individual and aggregates them with individual-level data from one or more other sources. By itself, a
data file containing the browsing history of 200 discrete individuals (each person’s browsing history
separately presented but with no information identifying whose history it is) may not seriously threaten
the anonymity of those individuals.
Where does an aggregator obtain the data sets that it combines? One major source is to develop
profiles of users’ Web browsing habits by placing cookies, tiny pieces of code, on thousands of
websites to track users’ online movements. Aggregators generally are in the business of selling this
data.
Privacy Policies: Did Someone Say Privacy?
These days an online merchant is likely to have a privacy policy posted on its site that describes,
among other things, what data it collects and how they are used. Internet vendors, social media sites,