Tumblr has found a major security bug in its platform that could have leaked people's most personal information, it has said. A problem with the innocent looking "recommended blogs" screen could have given up people's email addresses, passwords, old accounts, and where they were. The issue has now been fixed and there is no evidence that it was actually used, Tumblr said. Users don't need to do anything to keep their account secure. The I.F.O. is fuelled by eight electric engines, which is able to push the flying object to an estimated top speed of about 120mph.