Forum Thread: Ethical hacking

Hey! Couple Quick Noob questions.i'd Like to Know That in Order to Find Bugs or Vulnerablities in Sites Like Facebook,Google Do I Need to Get Permission First or I Can Just Start Finding Vulnerablities and Report Them When I Found Them? And Do I Need to Stay Anonymous While Finding Vulnerablities Because I Am Going to Report Them if found.do I Need to Hide My Identity?..Thanks