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Have you heard about Peerplays? I think they run on the same blockchain technology as Steemit. I even think that they're considering connecting to the Steemit chain through a side/sub chain.

Really interesting ideas behind it. I invested a little into them a couple of months ago. What sold me was the idea that a casual weekend gamer could bet a few dollars here and there in their favorite game (kind of like small stakes poker) and game in competitions for money.

So the Gamer Hub is probably one of the most developed ideas so far. For more info check them out, they have an account here https://steemit.com/@peerplays

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