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Hello again!

The way I always check the answer to this question is through coinmarketcap:

https://coinmarketcap.com/currencies/library-credit/markets/

The market pairs are displayed here and for LBC it looks like CoinEx is the most popular. I was thinking to buy some myself but will likely use Bittrex as I already have an account there. It seems to me that any decentralised social media sites which really have their act together, particularly those with video hosting, will see a decent surge in light of the blatant censorship going on with YT & FB.