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First of all, welcome to Steem! This is a bit misinformed but please don't take that as a dig at you. There's a heck of a lot to know about this platform and it would be unrealistic for the average user to know all of these things.

My account was activated yesterday and already I have 178 followers, almost all of them are fake accounts. After I posted my first blog I instantly had over 80 followers in under 2 minutes, that's a problem.

Fake followers, yes absolutely, there's a lot of them. I agree that it's really annoying.

Anyone can create an unlimited amount of accounts for free

They're not free, there's an account creation fee set by the blockchain.

So it is ok to allow people to abuse the rewards pool as long as they don't invest into the Steem currency?

If they don't invest in Steem in one way or another, their accounts will have no power to affect the reward pool. You need something called Steem Power to affect the reward pool and that requires some type of investment.

Also, there seems to be some confusion between Steem and Steemit. Steemit is a privately-owned company, which is one of many that displays the content of the Steem blockchain. You wouldn't be investing in Steemit, the company, you'd be investing in Steem, the network.

Hope that helps clear up a couple of things without going into too much detail. Let me know if you have any questions.

Well said, not too far from the truth.
I have been around for a while now, so far I keep wondering the extra stuff others do to make steem dollar

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