Yonatan Zunger, the Chief Architect of Google+, posted on Google+ a study of how positive and negative feedback on people’s posts in social networks affects their future behavior. Specifically, this looks at how “Data Mining Reveals How The “Down-Vote” Leads To A Vicious Circle Of Negative Feedback.”

Yonatan from Google+ said that is why you don’t see down voting on Google+ and that YouTube is making efforts to change how they handle down voting.

Yontan wrote:

So now you can go ahead and down vote this story but you can’t down vote Yonatan’s post on Google+.