User blog comment:DaNASCAT/Technical Update: June 10, 2015/@comment--20150611154831/@comment-5275700-20150612174145

Indeed, it was stats. With the old icons (the SocialIcons add-on) that included Google+, we saw very little sharing taking place on that network. And Google Analytics showed us that Wikia content was being shared on Tumblr and Reddit, even without buttons, so those won out over Google+.

If you (or anyone else) found that you were getting lots of engagement via Google+ sharing, we would love to hear more about that!