What are Ambassadors?

Hello,this is nick,I put my idol 4s in the marketplace and you closed the thread and suggested I read the rules, please excuse my ignorance but I have no earthly idea what I did wrong,did I break every single rule or something? And it was a horrible experience trying to upload my 1 photo, it took forever, and before you ask,yes I had good connection and everything was right,thanks for your time

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