Following a hack attack on crowdfunding site Patereon, about 15 gigabytes of data including names, addresses and donations have been published online.
Patreon allows people to make regular donations to artists for projects.
Chief executive, Jack Conte, said credit card details were not amongst the stolen data.
On the firm's blog he wrote: "We do not store full credit card numbers on our servers and no credit card numbers were
"Although accessed, all passwords, social security numbers and tax form information remain safely encrypted with a 2048-bit RSA key."
According to Patreon's statistics the site was attracting 16 million views per month and, as a precaution, Conte urged site users to change their login details.
Security expert Troy Hunt said the data published online appears to be genuine and added that he had identified 2.3 million unique email addresses among the stolen data.
He added however that many tens of thousands appeared to be auto-generated.
Return to internet news headlines
View Internet News Archive