Can you answer these please in a great and simple matter

please

1. What measures are social media networks taking to address defamation, hate speech, and pornography on the Internet?
2. What are the differences between a high-quality software system and a safety-critical system?
3. Identify three measures taken during the development of a safety-critical system that cause such systems to cost more and take longer to complete.
4. Identify two ethical dilemmas that software developers face when building high-quality or safety-critical systems