Still, it's safe to say the boss isn't going to be happy with a worker who uses Facebook to post invective-strewn rants, or to reveal proprietary, confidential or embarrassing information.

WSJ: Social-Media Sites Can Mean Trouble at the Office

Millions of users worldwide depend on the EAL 4 certified, enterprise-software standards-based GuardianEdge Data Protection Platform to safeguard confidential or proprietary information, to ensure compliance with regulations for maintaining consumer privacy and to enable secure enterprise mobility.

FORBES: Symantec Acquires Encryption Provider PGP For $300 Million

Some lawyers say the disclaimers have value, alerting someone who receives confidential, proprietary, or legally privileged information by accident that they don't have permission to take advantage of it.

WSJ: Email Disclaimers Proliferate