The key answer of exercise 9

a)

a blog / a social networking site

• where you're from
• family information
• likes / dislike
• hobbies
• favourite music / food
• religious or spiritual beliefs
• pet peeves
• groups you belong to
• trips and unusual experiences

a networking site for professionals / a job application

• talents and skills
• education / grades / qualifications
• goals and plans
• address
• job
• professional achievements

b)

• You should only include information you are comfortable with and which you think is relevant for the purpose.
• Always consider the reader and what he / she wants to know.
• It's generally best to avoid certain topics, such as religious beliefs, anything too personal or confidential information about your work.