As of 11/14/16, a new inter-site voting system was created. Here is a quick tutorial on how that works. :)
To have this menu pop up, hover over the blue box underneath the quote button.
The first option is the classic "like option" it's always been there, now it has a little makeover.
The second option is a dislike button. It's the opposite of liking something. REMOVED 11/15/16
The third button is the agree button. Use this if you agree with someone.
The fourth is disagree, the opposite of agree. REMOVED 11/15/16
The fifth is funny, if someone says something funny, use that.
The sixth is winner, that's for if you have a question or "guess the XYZ" thing. RENAMED TO AWESOME 11/15/16
The seventh is informative, and that's if someone says something helpful.
The eighth is friendly, WILL ADD SOON. REMOVED 11/15/16
The ninth is useful, for if someone says something... useful.
The tenth is optimistic, if someone is optimistic. REMOVED 11/15/16
And finally, the eleventh, creative. That's for if someone has a creative mod you like. REMOVED 11/15/16
Don't use these exact guidelines, break them. Just use some common sense.