The Brief: A hashtag used for expressing gratitude or appreciation, or acknowledging good luck or favorable circumstances.

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#Blessed is a hashtag that is typically used for expressing gratitude or appreciation, or acknowledging good luck or favorable circumstances.

https://twitter.com/MaRissKinimaks/status/1018998690608906243

https://twitter.com/_chlojob__/status/1018498696667951110

It can also be used sarcastically or in a mocking tone.