Some times it is hard to know if you have stuck a sticker instead of giving it because the screen for giving a sticker is the same as the one for sticking a sticker. It would be nice to get a notification on the next screen of "You have successfully stuck ____ with ____ sticker!"

I think that'd be really nice. I am always really worried when my friends ask me to stick stickers for them, because I'm scared I'll mess it up instead of helping them out. A confirmation could go a long way to relieving some of my concern.