Here are some policy fragments that come from a variety of corporate policies.
All Internet activity should be related to company business only.
Be aware that any document being sent through the Internet is going into the public domain (and therefore act accordingly regarding company confidentiality policies).
Do not use your company password(s) for any Internet applications/activities.
This corporation's policy is to control all modems through a central location connected to the LAN. Users are not permitted to acquire/install/use modems at their workstations. To help enforce this, users do not have access to analog phone lines at their workstation.