Google is a outright ghost town and nothing much as regards traffic can be derived from Google Plus. If you want real traffic then facebook is the place to be. After that, twitter and linkedin follow.
I am totally agree with you. Facebook has the maximum number of active visitors so It is very easy to get them into your site.
facebook is old as compare google+ but now these times google+ increase the strength. and now this time popular. facebook have many user but some some times its slow and my knowledge next some year google+ is very strong completer to facebook social markiting
Both are good at their place. It depends on you and amount of time that you can devote on particular website. Normally i drive good traffic from FB but sometime from G+, Stumble and Twitter.
Currently, FB is better as it has lot more users than G+. Google Plus page will bring a lot of traffic after few more months, when it equals the total no of FB users. I personally thin G+ page is better and it drives traffic to my blog, more than FB!
in Web World, the Search engine turn the people to Google, the word Social Web Site turn the people to Facebook. Facebook always best still now and G+ starts it's growth.
For me, I found that G+ actually drives more traffic but it depends on what your facebook following already consists of. Also your niche can factor in to the following you may gain on G+. I've found that many g+ popular posts are technology related (Not saying all are, just many).