Anonymous and unregistered users with < 15 reputation (the amount required to earn the upvote privilege) will now see
on every post in the area that a logged in user would see "add comment":
When the post area is moused over, the area expands to:
Was this post useful to you? [Yes] [No]
once clicked it will say
Thank you for your feedback.
The goal is to offer the 90% of our traffic that is anonymous users a way to provide more meaningful feedback on posts rather than passively incrementing a view counter.
This click data is currently being evaluated to see what we can do with it. Ideas welcome!