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True, but if the social site is successful, does it matter how the users are compensated?

If compensation for content creation is your selling point, I'd say it matters a whole lot. The ethereum network cannot handle it, let alone the costs it would incur in transactions if it were capable of handling it.

They have said that about Bitcoin for many years, yet still it persists. You may be right, but I don't discount the imaginative devs and their desire to find solutions.

Bitcoin, Ethereum, and Steem are three entirely different codebases/ideas/platforms entirely. I'm speaking technically, a social platform on top of Ethereum isn't sustainable or even worth pursuing. There's a lot of pie in the sky people out there that aren't think about the big picture. You have a lot of front end devs wanting to "revolutionize," stuff by throwing popular (ethereum) blockchain stuff at things. It doesn't work that way. If they were smart, they'd take a step back and develop against EOSIO.

They have an on chain wallet and off chain wallet option.
The rewards are not real time but get distributed end of day from a pool. This mitigates the scaling challenge quite successfully. Seems like they have done an amazing job at figuring this out :)