I have found that it is worth it to post on Google + as I have a different set of friends there. I had a surprising jump in traffic (more than 100 hits over normal) due to one post being shared across this network for one particular post. So, I think it wise to use this resource as well as facebook and other social sites. It seems to me that users on Google + are more subject- versus person-oriented than facebook users, but I may be wrong. People don't seem to share every personality sneeze as they do on facebook.