Thread not closed but gone !!!

[caesar44]

A new thread that was opened by me is gone , just like that . Without entering (for the moment) in to the subject of the thread , can someone please remind me the reasons (ForumRules) for erasing threads .
This is the first time I saw it in my 11 months here .
Btw - the amazing thing is that no one can see the thread (well...) , so how can one be able to discuss about it (...)