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I'm with @Glen1972, I feel bad if I don't give out more lives than I receive and it is the nicest way of saying thank you. As with your Maestro, I have Charu who always hooks me up and I'm greatly indebted to her/him. The players who use Facebook know who to thank and help each other out, but out of 73 in my group there are only 2 who regularly send lives.
Sorry @smusher , I missed this the first time I read the thread. When you go to start a level, there is a list of all the players in your group and their scores. I don't know how it looks on iOS but on android it is at the bottom. If you click on the pink heart near the player's name, it will send a life and change to a green tick. It will only let you do this once per player per log in to the game so if you want to send more than one to the same person you will need to quit and restart the app.