There a psychological bias called the &quot;false consensus effect&quot; whereby people overestimate how similar other people are to themselves. It&#x27;s backed up by things like confirmation bias where you tend to socialise with people similar to yourself so it feels like most people really are like you.<p>The simple reality is that you just don&#x27;t know enough people to draw any statistically relevant conclusions about society. It may well be the case that none of the young people that you know are on Facebook, but that really only says something about who you know, not about young people&#x27;s attitude towards Facebook in general.