A 22-year-old was arrested in hacks of Twitter, TikTok and Snapchat.

A 22-year-old man was arrested in Spain on Wednesday in connection with the hack of more than 100 Twitter accounts last July, becoming the fourth person charged in the incident, which led to a temporary shutdown of the social media service.

The man, Joseph O’Connor, faces charges in the United States of hacking, extortion and cyberstalking in the Twitter breach and is accused in hacks of the TikTok account of the popular creator Addison Rae Easterling and the Snapchat account of the actor Bella Thorne, the Justice Department said.

The Twitter incident began when the hackers connected last year in an online forum focused on buying and selling rare user names, some of the individuals involved told The New York Times at that time. They then broke into Twitter’s systems by tricking employees into providing login information, according to legal filings. The hackers used an administrative tool to take over accounts belonging to political figures and celebrities, including former President Barack Obama, Kanye West and Elon Musk, using the accounts to conduct a Bitcoin scam, the filings said.

Graham Ivan Clark, an 18-year-old who prosecutors said was the “mastermind” of the Twitter hack, pleaded guilty to fraud charges in March in a Florida court and agreed to serve three years in juvenile prison. Two others, Mason Sheppard and Nima Fazeli, were arrested and accused of serving as middlemen for Mr. Clark to sell the Twitter accounts.

In June 2020, Mr. O’Connor made false police reports threatening violence at schools, restaurants, an airport and a residence in Southern California, the affidavit said. The threats were an attempt to cast scrutiny on a youth who lived in the area and had clashed with Mr. O’Connor online, the affidavit said. Mr. O’Connor also sent threatening messages and nude photos to the youth, the affidavit said.

In August, a month after the Twitter breach, hackers took over Ms. Easterling’s TikTok account, which had more than 55 million followers. In an apparent reference to Mr. O’Connor’s online moniker, her page was updated with the message “plugwalkjoe zak n crippin.”

The F.B.I. found that Ms. Easterling’s account was accessed during the hack by internet protocol addresses linked to Mr. O’Connor, the affidavit said. They also found screenshots of her account saved in Mr. O’Connor’s Snapchat, the affidavit said.

Twitter declined to comment. Representatives for Snap, TikTok, Ms. Thorne and Ms. Easterling did not immediately respond to requests for comment.

Mr. O’Connor, who is British, faces extradition to the United States and will face charges in Northern California. A lawyer for Mr. O’Connor could not be immediately identified.

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