Those emails are common given that almost one billion login credentials have been stolen and shared online in the last year. Yahoo, MySpace, LinkedIn, Dropbox and Tumblr, have all been hit and the list goes on and on.
The worst part is the uncertainty that comes in the wake of the warning - do you panic now or later?
Computer scientist Jeremiah Onaolapo and colleagues from University College London decided to find out how quickly criminals react once they get access to an online account.
