Both these social networks helps to get high traffic from the internet. Google+ is best place to get high traffic compared to Facebook, but customer engagement is will be very low compared to facebook.
Both are good for internet marketing and promotion in social media. But I think that facebook is better, facebook ads are really good, thanks to this tool (even if I need to invest my money in it) it gives me bunch of really well-suited target of users.
Everyone here are addressing the same name Facebook. Majority is Facebook user because people are more active on Facebook rather than other social networking sites. But it is fact that you are find more fake account on Facebook compare to less in Google Plus.