We have rules posted in @theinkwell about sourcing images. If people post stories without sources (or worse — that have a company's watermark), we explain the rule and give them a day to fix it. (And if they don't, we mute their post.)
Many people don't understand how important this is, and I too am forever explaining it!
Very true @jayna!!!
Say, if you don't mind, I was curious to your rules on posting stories. They're supported to be short stories, yes? Would you mind posting a link about your rules?