I like to help friends by posting Up for Grabs letters. I also try to send to people I know are playing.
I prefer to send gold letters to people who need them, preferably to people who have sent to me. If you've sent to me I try to reciprocate but may eventually send a letter you don't need if I don't find letters you do need.
I usually find all the Eggs of the Day a couple hours after reset. I will IGNORE eggs of the day sent to me later because they are useless to me. Please post them instead