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People buy and sell memes for coins or something doesnt make sense because anyone can just download a picture. It needs to be more like Steem and somehow i corporate ads into a website about memes maybe. Best memes get coins for likes that are used to get more views and more views = more ad rev maybe.
This is better idea for OP project. Especially if OP wants the platform look like social media, get coins from likes, view, share, ect.
There's need a moderator too, to see and control the platform from account abuse, multiple account, ect.