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I wrote an article a couple of weeks ago about some of the Steemit Etiquette I had learnt in the 3 months I've been here, in particular regarding the self upvoting, but yeah, there are ways to ask for upvotes, like in a good post. But I think the "Sir I need your upvote" might be a simple troll. To be ignored. Though good to note the person in case they begin to abuse and spam upvote requests.