More than 65m Tumblr emails for sale on the darknet

Company only now discloses scale of hack three years ago - shortly before purchase by Yahoo - as database of passwords is leaked

Personal information from more than 65m Tumblr accounts has been discovered for sale on the darknet.

Tumblr disclosed the leak, which it says took place in early 2013, this month, but had not previously acknowledged the scale of the database that was compromised.