Is it OK to just give away some game keys here on the forum?

The reason I ask is because I have a list of keys in a text file that I guess I haven't kept in good order, so some games I've given away on the site ended up being used already and I had to give a substitute.

I don't want to do that again, and my list of keys is obviously out of sorts and I can't trust it, so I'd like to just post up some keys and let people take what works.

If that kind of thing is acceptable, then I'd like to post some keys after Christmas, after I've given some out to friends/family.