Board Thread:New Features/@comment-25258875-20140915124928/@comment-452-20140915164951

Then there are still problems with the "You have new messages" notification if two users sharing the same IP go to the same wiki.

And there are still problems when blocking an IP shared by two users who go to the same wiki, which, per the first post, is the reason a notification should be sent.

edit: I would rather a false notification be received by a shared IP than a block be given to a shared IP because there was no way to contact them.