You've got to Circle people to get people to Circle you back. If you want to enter into conversations you've got to follow a few folks. (Hangouts on topics you care about are a great way to meet and Circle people.) And as you begin finding your tribe on G+ you can create your own Circle based on your topics. For example I have Circles on MUSIC, TECH, and PHILOSOPHY. Go find your tribe on G+ and then Circle, Hangout, and share with them.