One of the forums I use utilizes a "reputation" feature. It allows members to "rep" posts they find insightful, well thought, or just humerous. Members who recieve rep get the message and a notification of who it is from. As a person's rep score grows, they gain badges, allowing users to see an online user's reputation within the forum- something that, combined with post count, helps people evaluate the source of information. Users are also allowed to opt out of the rep system.
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