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What can you do with bitcoin that you can't explain with steemit?!

I'm not sure what you are asking. Could you rephrase that?

It is just a different type of cryptocurrency. Bitcoin is generally more accepted than other cryptocurrencies. It is kind of the standard. Also, one Bitcoin holds a lot more value than one SBD or STEEM.

To me Steemit is the future of applications and bitcoin:D//

There is fundamentally no difference?
Why does BitCoin hold more value? Is there a structural reason or just psychological? Is it because BitCoin was first and has better name recognition? Better PR?

There is a difference, one is Bitcoin, and one is SBD. It's like comparing the U.S. Dollar and the Peso. The Dollar holds more value than the Peso because it is accepted in more places around the world. USD is more useful than Pesos.

Is it because BitCoin was first and has better name recognition?

Somewhat, yes. Bitcoin has been around for a longer amount of time, and it is very established and accepted as payment for so many different things.

The value of SBD may skyrocket and surpass Bitcoin. At the same time, it is possible that Bitcoin's value will take a dive. It just depends on the market.