A technique that identifies registered or guest users in web meetings of the type wherein users must follow a supplied URL to attend the meeting. Registered and guest users are provided different forms of the meeting invite URL. Each registered user receives a common web meeting link (a URL) that he must follow to join the meeting. This link forces the registered user to authenticate to the service when used. A guest user invitee receives a unique URL for the meeting that is generated with a nonce value associated with the guess user's contact information. The nonce value does not expose the contact information. To join the meeting, each registered user must follow the common web meeting link and authenticate to the service. True identities of the web meeting participants are displayed.