User blog comment:Dopp/Message Wall Now Available in Labs/@comment-3136913-20120130011554/@comment-3136913-20120131024106

It's not the groupings themselves, it's the fact that on the wiki activity you can see someone's message. If they reply to my message about Chocolate the whole wiki can read it on the wiki activity. with talk pages, it just notes that someone edited the talk page. I think it would better for the message saying someone has just posted on the message wall.