Message boards don't just become thriving online communities, once they are launched. Once you have people participating in your community, you will need to encourage them. Part of community-building is rewarding and highlighting frequent participators. Keep track of your star users and write to them off the mesage boards. Also, have periodic events and activities to create a sense of place, with the passing of time and highlight landmarks that pertain to your community. You need to create a community within your community, as this helps give your members a sense of ownership. After you have created this core-group of users, they will help you build and sustain your larger community.
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