Computer: Web: Cookie
Bidirectional cookies   (+2)  [vote for, against]
Browser option to connect only to servers that accept cookies from clients.

In the spirit of sousveillance, Internet users should be using something akin to cookies to track the behavior of commercial websites and their operators. In the spirit of crowdsourcing, Internet users who participate in this activity should 'compare notes' using databases.
-- LoriZ, Aug 12 2010

random, halfbakery