So I have been browsing the forums a lot recently and I have seen loads of people saying they will "Gift for Gift" and a lot of "This person didn't gift me back". I recommend not gifting to complete strangers and expecting something in return. If you gift them and they block you and not gift you back in return they are not breaking any rules so nothing can be done about it, they are just a jerk for not keeping their end of the bargain. So unless you can really trust the person, I recommend not falling for the Gift for Gift scam.
From Your Friendly Neighbourhood Spiderman