Just to clear some things.. I have already confirmed that you may "communicate in any way you see fit" when asking about using forum PMs or direct in-game means, before I started using the PM system. In-game PMs can be unread, chats on the game can be ignored (pretend you didn't see it or is afk) unless you're catching the person right when they are talking with someone - basically everything can be cheated if there is a dishonest person. For PMs, we should be honest and read it in chronological order and respond only with the fact that we have at that moment. But then I guess it is too prone to cheating if someone is tempted to. So yeah, I agree, let's stop with the PMs for now..
Actually, I would propose a system to fully log all transaction of info, that is ALL information trade should be done via email only, and cc'ed to fyrd. Even if you get it for in-game favors etc, you must log the transfer of knowledge via PM, cc'ed to fyrd's email so all information transfer is fully logged - and with timings clear. You may only use information that the log shows you have at that time, otherwise it is invalid. Any thoughts/comments anyone?
Edit:
@asterdai: I believe you need to say I go to the toilet every tuesday and sunday or, if you have a halo on your head for example, something like the person who has a halo on his head goes to the toilet every tuesday and sunday. If we only say there is a person who goes to the toilet every tuesday and sunday, there is no possible way of identifying the person (other than having ALL facts from ALL players and looking at whose 1 fact you're missing). Fyrd, please CMIIW here.