When using communities you might not think about getting more followers. Your caught up in sharing something with other people that have the same interests. But communities are one of the best ways to meet new people. Meeting new people is what gets you the followers. The reason communities are so good for meeting people, is that you can find a community about something that you are interested in and everybody in that community will had the same interest. So when you share to the community you will only be sharing it with people that appreciate it. So these people might just follow you. Its that simple, just share to communities, and communicate with others in the community.
You can also use communities to share your blog and website posts. Again you just find a community that relates to your post, then share it. Even when you do this people will check out your profile and they might add you. Just remember when people follow you, you should follow them back. It will cause a domino effect where you will show up in their followers suggested when they are looking for people to add.