I noticed a post that had the 

> marked as duplicate by:...


But the 

    Possible Duplicate:
    .....

in the question wasn't there, at first I thought it was a bug, but another user informed me that it was removed in an edit. 

That surprised me that a user just can edit out or `Rollback to Revision X`, to an earlier time. 

My suggestion: make the: `Possible Duplicate:...` stamp in the answer uneditable. Only by mods or one with a high enough reputation! 



 - http://askubuntu.com/q/231512/36315



**EDIT**:

The user rolled it back again:

 - http://askubuntu.com/q/231512/36315

I informed the user to stop rolling back, and re-added the duplicate stamp.