Such pervasive monitoring is accomplished through the use of very small computer files known as cookies, Flash cookies
, and beacons.
For instance, while an HTTP cookie stores just 4KB of data, Flash cookies
can store up to 100KB.
These characteristics are the reason flash cookies
are often referred to as super cookies.
Online tracking technology is also evolving as legacy tracking techniques like Flash cookies
fall out of favor and HTML5 rise.
Consumers have expressed privacy concerns especially over the use of flash cookies
, which are not stored in browsers that consumers can see or control, according to the bulletin.