I know it could be silly to ask on Tumblr, but how many people really use G+? I have a lot of work...

I know it could be silly to ask on Tumblr, but how many people really use G+? I have a lot of work that needs to be done and can’t spend my life on every site ever. So I kinda do nothing with my G+ but by doing that am I snubbing a ton of people who only use that?