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The amount of karma you can give depends on how much karma you already have. Click the Karma button on any post and a pop-up box will tell you how many Karma points you can add to a particular post (you can adjust it downwards, but not up).
As for whence your karma came, click the User CP panel and it'll show you who gave you karma, and for what post and if they made a comment to go along with it, although not how many points you got for it, except in total.
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