Here is a description of its functions:
Contact List is an modification for phpBB 2.0 that adds the combined features of a buddy list, an ignore list, and a "disallow contact" list. A Control Panel is also included, through which users may add or move other users to their lists.
The buddy list portion of Contact List allows users to create a list of 'buddies' composed of other users. This list can then be used to inform the user when 'buddies' are visiting the forum at the same time as themselves and to allow easy access to the 'buddies' usernames when sending private messages.
The ignore list portions of Contact List allow users to completely remove almost all indications of certain other users. When a user adds a person to his or her ignore list, the person's posts and topics will not be displayed to the user.
The 'disallow contact' list in Contact List lets users completely prevent
certain other users from contacting them through the forum. The 'disallowed' users will not be able to see the user's contact information (email address, IM address, etc.) or profile. They will also be prevented from sending private messages to the user. The user is still shown the 'disallowed' users' posts, etc.
Please review the FAQ about the Contact List Mod.
Thread drift will be removed.