G+ has more active users than Instagram based on the released data. They purposefully don't release too much information, but the figures that have been announc

G+ has more active users than Instagram based on the released data. They purposefully don't release too much information, but the figures that have been announced show G+ to be far larger than Instagram. Instagram claims more than 100M signups, Google claims more than 500M. I don't see MAU for Instagram, but Google+'s MAU is 135M which is more than all of Instagram's signups. Like any social network, what you see is dependent on who you are and how you use the service. Instagram is much more wide open than G+ as well, people are much more likely to share content to only a few people on G+ and thus you'll never see that content (or any replies). From what I've heard from photographers, G+ is definitely an active place to share photos.