In a nice day, when you was posting for bounty campaign, suddenly your FB account was blocked. So terrible an troublesome !!!!!!!!.
Never happened to me. But there must be batches of reports that your post got so in result you are blocked.
How do you to prevent your FB account locked again in the future?
Just don't violate facebook's terms of agreement and crypto's are hot topic on facebook due to ban together with the cambridge data scandal.