Google Drops Who +1'd A Page In Google's Search Results

For years, Google showed in the search results, when signed in, which one of your friends on Google+ +1'd a page found in the search results. They've been doing this since 2012.

I am not sure when, but Google dropped the +1'd details in the Google search results some time ago. I don't think I ever covered it here and not sure if anyone else covered it, but the +1'd details are gone from the search results.

Here is a picture of what it looked like way back when:

This is what it looks like now:

Tadeusz Szewczyk asked about this on Google+ saying "What happened to the "John Doe shared this on Google+" notifications on the SERPs?"

So what did happen to them?

Forum discussion at Google+.