When it comes to using outlets for social media diversity is good. No one channel is the Holy Grail of social media. Try several sites find the sweet spot of your audience. Give it time to warm up for the organization and the followers. Research and listen to what competitors are doing to attract and maintain interest.
Once a comfort level has been established between the organization, channel and audience indulge in it. Test those waters with polls and questions with answers series. Keep them engaged, especially in the beginning have them going to your source for all the answers. It will not happen overnight, be persistent. If you build it, they will come. DH