Sgt_Kickaxe - 7:44 pm on Feb 15, 2012 (gmt 0)
If you do not have Google+ on your site it seems to NOT be a ranking factor. If you DO have Google+ on your site and are not getting any clicks to it you may actually be hurting your own rankings since the message to Google is "not very popular compared to xyz site".
Use Google+ if your visitors use it, otherwise dump the bloat altogether, imo. It doesn't belong on all sites.