Couldn't you add them and thank them through Steam chat?
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You should still be able to find that person's profile. Get the link to the giveaway, then either log off or go on another browser, go to the giveaway and you can get the gifter's steam profile.
Edit: Or what trentjaspar said below. His method is less convoluted :D
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Some people blacklist their winners so that they can "distribute" the games to other players. In those cases, it's not personal.
But I don't think anybody (including the GA creator) will expect you to go out of your way to thank him/her.
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So that their games go to different people-- so that nobody wins more than one game from them.
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You can also look at your giveaways won page, then click on his/her username, then the Steam icon to reach his/her profile.
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How i suppose to thank an person i won GA, who blacklisted me? Watmeme.gif
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