With the recent closing of Google+, web engineers have removed Google+ from social links and for quickly sharing games from the website. However, it appears that Google+ was not fully removed from profiles as it still appears if the user set it before Google+ was removed from social links on the settings page.
A post was merged into an existing topic: Off-topic and bump posts
This user still has a social link for google plus:
Google plus was shut down on April this year and the link just redirects to this page: