This article explains what information may be shared with other users when you participate in Yahoo!7 Groups. It should help to explain what personal data may be posted in a group.

By default, the only information that is shared with other users on the Yahoo!7 Groups website is your Yahoo!7 ID (except for moderators will also have access to your email address on the “Manage Members Page”).

Additional information will be shared with group members in the following circumstances:

• When you post a message to the group, group member who receive messages via email will see your entire email address in the "From:" field (just as if you were sending them email directly).
• If your Yahoo! Profile is set to share information, members who click on your Yahoo!7 ID will be taken to your Yahoo! Profile page. Depending on your Yahoo! Profile settings, additional information may be accessible to group members. If you would like to use Yahoo! Profile – but don’t want to share that profile with group members, you can always set up an alias.
• If you are an email-only member of a group, your email address will always be displayed rather than your Yahoo!7 ID. Members of the group will only see part of your email address (e.g. john@company.com will simply display as “john@”), but moderators will see the entire address. If you have a Yahoo!7 ID that is your entire email address (which is true for many users with Ymail and Rocketmail addresses, as well as users with “Yahoo!7 Broadband Partner” email addresses like SBCGlobal, BTInternet, and Rogers), this email address will display with the same rules as described above.

NOTE: If you join a group that allows members to hide their email address and you choose to do so, then posting a message from the group website will NOT reveal your email address (either in emails or on the web) and moderators will not be able to see your email on the Manage Members page. However, this “hiding” will not work for any user whose email address is their Yahoo!7 ID.