CyberPower are giving away an EVGA GTX 580, the fastest single-gpu card on the market right now. All you have to do to be in with a chance of winning is comment on their Facebook post, share it with a friend and email them a screen-shot of your message.
Other rules and notes:
This contest is open to residents of U.S. and Canada only. Contest winners must submit an email to firstname.lastname@example.org in order to claim their prize. Winners will have a maximum of 7 days from the date of the winners’ announcement to claim their prize. Winner will forfeit their prize if s/he fails to contact CyberPower within the 7 day period.
Head on over and check it out.