Karma refers to points received from upvotes, which are the Reddit equivalents of "likes" on Facebook. You receive approximately one point of karma for each upvote, and you lose about one point of karma for each downvote.

You can receive different types of karma from the following types of posts:

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Visit large subreddits with more than a million subscribers like r/AskReddit, r/pics, or r/funny. Sort by either top of the hour, rising, or new and leave a comment on those threads. This ensures that your comment won't be buried under those that got there before you.