Answer:
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
What can bring back the dead. Make us cry, make us laugh, make us young. Born in an instant yet lasts a life time?
A house full, a yard full, a chimney full, no one can get a spoonful.
My first master has four legs, my second master has two. My first I serve in life, my second I serve in death. Tough I am, yet soft beside. Against ladies cheeks I often reside.
Something wholly unreal, yet seems real to I. Think my friend, tell me where does it lie?
What covers its face with its hands, speaks no language, yet most known what it's saying?