Newbie questions.

Hello all.
I've read the faq, but i still have questions, s if you can help me out getting started gifting, I'd be grateful.
1) I've read something about exploited cd keys for world of goo being banned. Does that mean world of goo cannot be gifted at all, or just that it cannot be gifted by those who acquired the keys illegally
2) speaking of world of goo, i have giftable copies tied to my steam account (I bought a 10-pack some years ago and still have a few copies left). T gift them would require me to "friend" the recipient. Is this acceptable or can I only gift alphanumric keys ?
3) does gifting earn you points ? Not that t would change a lot, just curious.

Thanks in advance for your help.

Abrahel