I haven't seen anyone talking about this, but I think this is a great new feature to the game.
When I sign in with google+ I can send or ask for things like health, magic, and tokens. The best thing about this that I noticed though is when you send your friends stuff it doesn't take it out of your inventory. So for example, if you send me a request for a health potion and I grant the request it doesn't take a health potion from me. It's just a free potion for nothing.
Good job with that feature! Only downside is there's a limit on how much you can receive in one day, but that makes sense since its FREE. I believe the limit is 3 items a day but may be wrong. But that's still cool, 3 free items a day for nothing.