I seldom post on these farewell threads, just open them to see who is the latest to depart. It is often someone whose contributions I have barely registered, so I just ignore the thread.

O.D. I don't really understand what has happened here (facebook and its like being closed books to me) so I can't comment on your reason for going, but I do know I will miss your contributions.   I hope you will feel able to return, and soon.