Some companies have done this, such as Chargify.com, but they often had to fight destructive customer service and public relations battles.

FORBES: Why Freemium Isn't Free

But self-destructive terms of service aside, Skipity seems to be a real search engine.

FORBES: The World's Worst Privacy Policy

American capital markets should not service Khartoum's destructive ambitions.

CENTERFORSECURITYPOLICY: Center For Security Policy