MADRID—A British man wanted in the United States in connection with a Twitter hack that compromised dozens of influential accounts has been jailed in Spain while he awaits possible extradition. Joseph O’Connor, 22, appeared before a Spanish National Court judge Thursday and refused to be transferred to the U.S. voluntarily, a court spokesman told The Associated Press. U.S. prosecutors accuse O’Connor of involvement in a July 2020 hack of more than 130 accounts, including those of prominent politicians, celebrities, and technology moguls. A criminal complaint filed in federal court in the Northern District of California also charges O’Connor for allegedly taking over TikTok and Snapchat accounts, as well as cyberstalking a juvenile. O’Connor has denied wrongdoing in previous interviews. No lawyers defending him could be located immediately. The Madrid-based National Court handles extradition requests in Spain. A court spokesperson said Judge Santiago Pedraz considered the charges against O’Connor grave enough …