You mean this?
https://www.steamgifts.com/go/user/76561198242625678
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Right now it's possible to get to the steam profile of any SG user by simply visiting their SG profile and clicking nice little steam button in the left panel. So you can get any SG user's steam ID this way.
However, I have not found any way to do the reverse, that is get to the SG user name from their steam ID.
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