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Unfortunately, that's probably almost as impossible as filtering out fake emails.

Does Steem use browser fingerprint with a machine learning component. It's very hard to keep a truly clean session and spammer patterns can be found quite quickly.

Looking at how much the steemit.com sign-up process is being exploited, I sometimes doubt that there's anything being checked at all!

Guy, are you still active here?
I need your expertise.

I know it's hard, but other sites have dealt with this too. I do wonder if all accounts should have to be paid for. Even a few dollars would deter such behaviour. I know that's an obstacle to poorer people, but Steemit could get overrun with such 'sock-puppets'. I just don't have the answers for this.

I'll probably discuss this with folk at Steemfest. It's an important topic

I think the proposed change in HF20 does have some potential by creating new accounts with zero voting power but a minimum allocated bandwidth without available stake instead.

At least this does take the incentive out of mass creating new accounts, but I am certain it also opens up some new exploits of its own!

I think there is plenty alternatives to charging people. The would deter most new users.