Board Thread:General Discussion/@comment-24739709-20151026190758/@comment-126761-20151028131715

A lot of JS functionality doesn't need to be run in page-specific contexts, and can be moved to the community JS pages - Help:Community CSS and JS. (As mentioned above, if the JavaScript review process is not already enabled on your community, just ask us to flip it on via Special:Contact/general.)

FishTank: no current plans for Google+ widgets, though I wouldn't rule it out.