People gave them to you.
You can check if they're good or bad; it's a little bit of trouble to do so however. Most of the time you can tell just by the comment left. Have you checked your User CP?
I went into the CP today to edit my isgnature. And then I saw this information bar that read:
16 point(s) total
Latest Reputation Received
And there's nothing "clickable" on it (just the "colllapse" button on the far right).
So how do I check my points? And where do I read the comments?
::EDIT::
Oh! wait! I get it now!! There are six of my postings listed below the score. All six postings must be the collective source of the points! Okay. I get it.
(Never mind!)
::EDIT::
And they're all positive!