Warnings to users (perhaps at certain times and locations), initial authentication, background check requirements, reporting and logging pickup location information and details as to which drivers saw which passenger signals, as well as logging all driver locations on an ongoing basis are some initial suggestions.

FORBES: Smartphone Taxi E-Hail Apps: New Convenience or Potential Deathtrap

Four out of five of them had been attacked by Trojan horses that sniffed out confidential information by logging keystrokes, recording internet sites visited, and reporting the findings to a third party.

ECONOMIST: Guard yourself against identity theft