Facebook and Twitter back Apple in phone encryption battle with FBI

As the US government attempts to weaken encryption, Facebook and Twitter have both come out in support of Apple. But why are tech companies so afraid?

Facebook and Twitter stepped into the battle with the FBI, with both companies pledging that they "stand with Apple" and will "aggressively fight" attempts to weaken encryption.

Apple is heading deeper in to a legal battle with the FBI, which is attempting to access encrypted information on an iPhone used by one of the San Bernardino killers.