Currently the New Profile Posts just gives you a list of all recent Profile Posts. There's no easy way to see what is new and what is simply recent. I'd like to propose that these work in the similar way to New Posts. New Profile Posts would show in bold based on the same setting for New Posts (eg 30 days). Viewing the New Profile Posts page would effectively mark all new as read (though they would stay bold on that page visit). In addition there would also be a "Mark Profile Posts Read" link to mark all Profile Posts read if there are multiple pages of new Profile Posts.