Upvoting and downvoting.

If you aren't familiar with these concepts, upvoting and downvoting are a way for a community to collectively register their approval or disapproval for a user's post, 1 point at a time. These votes translate into a poster's reputation and once a high enough reputation has been reached (50 at time time of this writing) you will gain the ability to flag individual posts for moderation.

This, in theory, will help combat spam and other unconstructive content. We'll see how this goes...
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