While third party cookies enable new web functionalities it also enables new risks exposure of a person’s web history. A person’s web history can inevitably reveal personal information which if exploited could lead to bad stuff(job opp/id theft/deals/black mail/embarassement). Thus, privacy should not be an option, it should be the default. Accordingly, browsers should disable third-party cookies by default; require users to "opt-in" to 3rd-party cookies).
II. How third party cookie works and the underlying web economics
Third party cookies enables single-sign-on authentication (e.g. Facebook Login), web analytics (e.g. Google Analytics), and third-party advertisements ...view middle of the document...
In the days that followed, more than 40 companies—including J.P. Morgan Chase, TiVo and others—have said that their customers were among the victims .
Secondly, majority of consumers are not willing to be tracked. According to a TRUSTe and Harris Interactive online survey , 78% of respondents would not consent to website analytics tracking, 85% would not consent to web browsing tracking for relevant ad, and 54% does not like.  When the options are available, 68% refuse to allow companies to share their information with a third party and 52% say that they choose to opt out of online behavioral advertising.
Finally, there is precedence for this opt-in decision. In 2009 the European Union passed the E-Privacy Directive legislation which required websites to acquire visitor consent before they could install cookies .
IV. Arguments against opt-out policy
Proponents of an opt-out policy usually have the following arguments.
First, they claim it will break the advertising supported model of internet companies . However, according to Mayer  there are many ways to mitigate the advertising such as Adnostic  and Google Ads Preferences.
Second, they claim users could always opt-out at their leisure. However, the procedure to opt-out is usually too complicated to people, and the...