Hi, I'm a newbie to geocaching and think it's great fun! I have sent my first TB's out into the big wide world and the person who has picked one of them up has kindly posted a photo and promised to move it on for me in the next few days. I just wondered whether it was 'the done thing' to send a message to the person who has done this to thank them or whether it breaks any geocaching rules of etiquette? Any advice would be appreciated.