We tend to think that the breadth of the community (circle) we are related to become widen. However, Lanier points out the problem of Internet. According to him, our communities and ideas have more subject to “lock-in” than in previous eras. In addition, the world of Internet might not have objectivity, because only a few engineers can construct the system of Internet. In such a “locked-in” situation, our communities have changed. 
   
   In the book, Lanier gives an example Facebook as a locked-in community. On Facebook, we have “friends”. The notion of “friends” on Facebook is a kind of different from the real one. This is because people can become a friend with someone even though we have no connection between us.
    
   However, some people tend to think their “friends” as real friends.  Moreover, when you post something about yourself, you only present it on a locked-in community in the end. Not a few people tend to see the locked-in community as an absolute community. 

   In short, people themselves are locked-in by Internet. Internet makes our life enrich. On the other hand, we have to keep our mind that too much dependence upon Internet might be dangerous.