New "via" feature is the retweet of Facebook
So far, "via" only works for shared links, so you can't use it for someone else's status updates. Since Facebook is a lot less private now, maybe they're working on aggregating links to further their ambitions as a real-time search property. I can see this feature being interesting, but I hope there will be controls to cut vias from specific people (or vias altogether, even) out of your stream. After all, it would get irritating very quickly to see the same link posted by 10 different mutual friends.