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The spknetwork have a token...It is a miner that generates the SPEAK token.

They havent created a PoB token yet for 3Speak. Might at some point.

What is the difference between Proof-of-brain and Proof-of-work Tokens??

PoW requires mining hardware. With $HIVE we "mine" it through PoB. It is the curation that determines how now coins in the reward pool are distributed. With PoW, those that solve the math puzzles are able to mine the coin.

Thank you very much. This very important information for me.

Glad to help you. Ask away. Questions are always a good think on Leothreads.

Bitcoin , Ethereum and other big coins are PoB based?

No. Only Hive and Steem.

$BTC = Pow
$ETH - Proof of stake.

Actually Hive is delegated proof of stake with PoB over the top.