I rely on the star ratings. I expect my nbrs to b tipping me on a nearly daily basis and yes I let them know this from Day 1. I feel that since I do this then they should also. I'll check the star ratings nbr list every 3-4 days and if they're on the list for more than 2 days then I'll delete them wo any warning. I explain this to them from the start. If I havent heard from them, in other words if they're not writing on my wall to let me know that they've tipped, I'll inquire to make sure that they're ok. It doesn't take but a few seconds to write on a wall. I don't require a missive, just a simple "t" will do.