Anonymous users are allowed to post comments on your site and page caching is enabled. An anonymous user posts a comment but does not see it because the same cached version of the page is displayed before and after commenting.
Content refresh to the rescue. If a new comment is posted and published the cache entry of the content will be deleted and the user immediately sees the posted comment.
Friendlist is a foundation needed to build a social network-oriented website with Drupal 6.
At the very basic level, it provides the ability to create custom relationships between users. It's a feature-rich suite of modules that features integration plugins with a list of major Drupal modules (see below). Admins can create relationship types. Both single (think: a fan) and two-way relationships (e.g. a friend) are allowed.
ATTENTION: If you enable Friendlist_Rules make sure that you use the latest DEV Snapshot releases of both Token and Rules modules (not: the stable ones) or the module won't work and will throw errors!
Documentation:
Just moved to new location, so under development: FriendList Docs
Configurable set of relationships. One-way relationships, two-way relationships with confirmation, two-way relationships without confirmation (using Rules)
Working user interface, out of the box, with configurable system messages [using t() function]