Facebook, the tool for sharing experience become following some specific person.
Facebook also narrowing the experience of a person.
Facebook successfully grouping people with the same interests.
Yes, it helps people with the same interests stick together, spend time together, however, at a result, people become spending less time to see things that is not their interests.
For a TV news programme, not all news we are interested but we have to watch them totally, at least we know what's happened for those we are not interested. However, in Facebook, we only pick those news that we are interested and ignore those we are not. Our experience is being narrowed because it is more easy for us to make a "choice".