I thought the problem was, that you have to be friends on each others list, so yes, one adds the other, and the other accepts, however, you then know x person is gifting you, and likewise, you'll send a request to the person that you're gifting to.
However, if you're just told 'add x and y person', it adds a 50/50 anonymity... no it can't actually, you will have to know who to gift to, leaving the other as obviously the sender :/
Of course, everyone could add everyone else on the list, if we have enough slots, I have 20 taken, and I heard from the Jimquisition that we have a maximum of 100 friends? So at 89 we can only keep our top 11, assuming it doesn't go up.
I really hope we crack last years number still.