UK terrorism
Arrested under 'spy' laws.
Muhammad Rabbani refused to give police the Pin to his mobile phone.
Community urged to 'build bridges' to 'keep hatred out'.
He will appear in court this afternoon.
The 17-year-old is the sixth person to be arrested.
Relying completely on algorithms isn't the answer, yet.
A total of five people are now being held.
Three people now in custody.
Social media networks accused of saying 'fine words' on issue but not doing enough about it.