I have been doing social media for some time but don't get much traffic from the social sites. I'm doing it more for getting backlinks. Getting traffic from social media sites is no easy job. We need the articles that stand out the crowd to get featured and gain traffic. It's amazing to hear that you are getting good traffic from social media marketing. I'm sure you must have published some entertaining and good quality articles on the the social sites.
Yes you have the right topics in your post. When there are no really much contents which are important for the visitors you have no change to get the community active.
But on the other way it is also important to get a change to create a google sitemap for the own main important Jive sites.