respond to my discussion has been deleted.....

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one of my friend responded me "nice discussion:-)" and that respond was deleted from my discussion and 10 star taken down to 9.I don't really think about those stars,but I am really feeling sorry for deleting my friend's respond.I really don't understand because,because I have never violated any rules or regulations and I am giving my best discussions to mylotters,not only thinking about earnings....It really broke my heart.....