yo what is the name of this site ?

You can't give it as a giveaway, no.

You can drop it on the forum.

Short answer: No.

Long answer: There are a few exceptions, like Minecraft. Uplay keys aren't one of them though, so try actually buying a game instead of giving away something you got for free.

Nope, you cannot. Cannot, may not, could not, should not.

Steam became a game? Have we been playing games inside a game all along?

There used to be an option to giveaway Battlefield 3 and Minecraft. Not anymore.

You can't create giveaways for non-Steam games, but you can do a key drop (Paste the key in a forum post and let the first ninja to come get it).
By the way, is it a free key (PoP or Silent Hunter 5)?

uplaygifts.com

you know what site you're on right?
i mean did you even read its name?