海角大神

More than two dozen Groupon customers this month are reporting on Twitter听instances of their听Groupon accounts being compromised, followed by fraudulent charges.

In July alone, 27 customers of the discount site听have tweeted that their accounts have been compromised or "hacked." This is nearly twice the amount customers tweeted about their accounts being compromised in any previous month since April.

In each case, customers received an automated Groupon alert that the e-mail address associated with their account had changed,听then discovered fraudulent charges on their credit or debit cards linked to the account. Most had difficulty reporting the issue to Groupon, since the link the company provides to dispute the changed e-mail requires that the user log in with their now-changed credentials. Some users were able to log in with the Facebook sign-in feature, removing their payment information from the service and canceling any orders placed.听In many cases, hundreds of dollars worth of merchandise were charged to their accounts before the fraud was caught.听

Fraud detection company IDT911 said that while the social media activity is reminiscent of the beginnings of fraud fallout from other data breaches, the听sampling is听currently too small to indicate a larger trend.

"Is it possible? Yes. Is it definitive? No," said Adam Levin, founder of IDT911. It's also possible the affected customers' data was compromised in some unrelated incident, he said.听The firm will continue to follow related activity.

Groupon spokesperson Bill Roberts said in an e-mail that the company has seen听"absolutely no evidence of a breach,"听nor has it seen an increase in compromised accounts.听He said account breaches often happen because of login credentials compromised on another site, and noted that accounts are locked down until customers can provide updated login credentials.

Yet, several victims say, they have not detected any other fraudulent activity associated with their other online retail accounts.

"It is incredibly unsettling," said Kristin Barrali of Boston, who was first alerted that her Groupon account might have been compromised when she received an e-mail from the company saying her account information had changed.听

Days later, she discovered her credit card was used to fraudulently purchase $4,000 in computer equipment shipped to an address听in Southern California. The Glendale Police Department is investigating the case. It's unknown if the听recipient of the packages is connected to other instances of other instances of Groupon customers reporting fraud.听

Another听Groupon customer in Boston,听Kelsey Jarboe, said her account was听compromised and $450 worth of fraudulent charges were听made July 10. Her account information was also changed, making it difficult to log into听Groupon鈥檚 help center. "I check my bank statements every day because, like a lot of people, I live paycheck-to-paycheck," says Ms. Jarboe. "I keep a very close eye on what I have. And if that weren鈥檛 the case, I might not have noticed right away."

Groupon shutdown her account the next morning and refunded her money.

The process wasn鈥檛 that simple for听Dennis Rodrigo, a Groupon customer from听Staten Island, whose account was compromised July 13. The day before, Mr. Rodrigo gave his landlord a rent payment and checked the next morning see if it had cleared. Instead, he found that $300 in perfume and two Apple TVs were听charged to his account, reducing his balance so much that the rent check wouldn't clear.听

"My landlord doesn't care if Groupon [had issues]," he said.听

It took him more than听12 hours to get the money back into his account,听which Rodrigo said his bank fronted him because Groupon would not confirm to the bank that fraud had occurred. Later, his wife received an e-mail saying the items had shipped to an address in Texas.

As a result of the recent flurry of hacking reports, many听customers say they will stop using Groupon. Sue Kim says someone broke into her account听June 7.听Soccer tickets totaling $100 were charged to the Washington resident's account, which took a day to sort out.

"I鈥檓 not inclined to go back and create a new account," she said. "Or if I were, I鈥檇 probably be more leery about it."

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