Ripples was a data visualisation tool which allowed you to see when and where a post was shared from. On a publicly shared post, you'd be able to access the tool via the chevron menu, and watch the "ripples" as a post is reshared. It was pretty cool, and I'm a little sad to see it go. For extra reading on this old favourite, make sure to add "Ripples Explained" to a new tab.
This is all in the name of a simpler and more streamlined Google+, removing the lesser-known/used features and keeping the things that work. In recent weeks, we've had to wave off shared circles, the "Nearby" stream and Google+ Local.
"Thanks for your support as we continue to make Google+ a simpler, more streamlined experience for all." - Official Google+ page
Although Ripples is a goner, the official +Google+ page has reassured that page owners can continue viewing Google+ analytics in the My Business dashboard. It just isn't the same though...
Are you sad to see Google+ Ripples disappear into the sunset?
Source: Official Google+ page