People who don't use facebook?!

All of my research has focused around people who use social networking sites but I feel I have been neglecting members of our target audience that do not engage with them. As a form of personal research, I have contacted a friend who does not use facebook. His reason for not using it is:

" I don't use it for that fact it takes up too much time, and you also talk to bullshit people who aren't really friends. My sister made a bet that I couldn't go on it for a few years too so I did it for that reason too." (19 years old)

He uses twitter instead, but is not an excessive user, mainly for talking to people rather than leaving statuses about himself. He also had a friend that does not use facebook, twitter or any other social networking site. I was also told he has a phone without a camera. He said:

"I can't be arsed with the whole friend thing, when most people on there are idiots, everyone I want to talk too is in my phone book." (21 years old)