While most of the opt-outs are intended to make life less annoying, they can also have the side effect of protecting personal information that can be misused by identity thieves or unscrupulous merchants.
“Over the years, it has gotten so much easier to opt out,” said Ari Schwartz, deputy director of the Center for Democracy and Technology, a public interest group that lobbies Congress on privacy issues. “There are still gray areas.”
While financial companies have to provide an opportunity to opt out of sharing personal information, other kinds of companies do not. Some that tell you they will share the information do not offer the option to protect personal information (other than not doing business with the company).
For those who just can’t take it anymore, here is a master list of where you can take control…” (New York Times )