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Experiencing banking troubles? Make sure you don't vent on twitter.

That was the case for customers of one of Britain’s high street banks, when many of their customers took to social media to complain after a computer systems migration left thousands of users locked out of their accounts.

The bank’s chief executive on Wednesday said they saw the daily rate of attempted fraud on its customers spike by up to seventy times following the outage and that around 1300 customers had money taken from their accounts.

A person familiar with the bank’s investigations into recent frauds said while it can be difficult for the bank to know for certain how criminals obtain information about an account, activity on social media is a concern. When accounts are compromised, it’s usually because a customer gives up their details and “a lot of that is entirely voluntary through social media”, the person said.

A Bank spokesperson said they encourages customers to be careful about how much personal information they share online. The more information made available on these sites, the easier it becomes for fraudsters to steal your identity.

Security specialists say news events like the bank's online outage are the perfect hook for scammers, largely because people using social media may identify themselves as a customer of a given firm making it easier for them to defraud.