As I understand it, "thanks for your help" and similar messages removed from questions. I believe the aim of this is to leave Crypto.SE as a neat and relatively formal Q&A, where each question is set clearly and concisely.
Personally, I think this is a good policy, but I was wondering if it should be written down in the 'how to ask a good question' section or somewhere similar? As it is, a new member asking a question is very unlikely to find this standard noted anywhere (I haven't been able to find it researching this) before having their question edited.
Possibly useful links: help:how-to-ask & help:quality