Web monitoring for ads? It may be illegal

Have you ever thought about that your online activities are under surveillance, moreover your private information is collected and supplied to the third parties without your prior consent?
With the increasing number of the internet-user, the scale of the online advertising has rapidly increased.
Broadband providers can easily monitor their users' online activities and find their interests.
Also, they can make an advertisement in favor of their sponsors profit, as they probably think that they have a right to those information gathered.
Don't you think that using the information of clients' those ways are illegal?
An article as below is the introduction of the related restrictions of 3 federal laws.

http://news.cnet.com/8301-13578_3-9947499-38.html?tag=ndfd.lede