In theory, Do Not Track is a brilliant idea.
It’s an elegant, simple bit of technology. A user-agent (typically a web browser, but it could be anything) that is compliant with the Do Not Track standard adds a tiny snippet of information in its header. DNT=1 means that the owner of that user-agent has expressed a desire that his or her online movements not be tracked.
Too bad it doesn’t work.
*Puts on tinfoil hat*