New York's top law enforcement official had been investigating Tether and Bitfinex over allegations that they tried to cover up $850 million in losses.
The decision follows negotiations between Facebook and Australia which is set to pass a new media law that will require digital platforms to pay for news.
The letters show lawmakers are looking to hold traditional information sources accountable for misinformation while they also grill social media executives.
Oracle stock had its best day since March after an article suggested the company could have potential in cloud computing. Oracle isn't a cloud leader, though.
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