By default, BuddyPress does not include comments from non-members (or non-logged-in users more generally) in the sitewide activity stream. This plugin records activity items for those comments.
Please note: the latest version of this plugin (1.2) will NOT work with versions of BuddyPress between 1.2RC and 1.2.1. BP versions 1.2.2+ are supported. Please download an earlier version of this plugin for compatibility with older versions of BuddyPress