Since it outsources its help desk, each and every call to the service provider incurred a charge, and before long password-reset costs ballooned to millions of dollars.

FORBES: Magazine Article

Twitter has reset the passwords and revoked session tokens, which allow you to stay logged into the service without reentering a password, for all of these accounts.

CNN: Twitter hacked; 250,000 accounts affected

To cut down on those costs, the USPS created a self-service Web site and set up a phone line with voice-recognition software, either one of which lets users reset passwords on their own.

FORBES: Magazine Article