> In Twitter’s case, one of the limitations in place was to reject anyone who tried to upload a long list of sequential phone numbers—a sign that this person wa

> In Twitter’s case, one of the limitations in place was to reject anyone who tried to upload a long list of sequential phone numbers—a sign that this person was almost certainly not uploading an address book in an attempt to find friends. > The workaround is almost comically simple: someone could just upload a long list of randomized phone numbers instead. And that’s how the security researcher whose work tipped Twitter off to this problem was able to match up ... for 17 million unsuspecting Twitter users, including high-profile officials and politicians around the world. The biggest tech companies in the world, ladies and gentlemen.