The problem is that lists don't work both ways. People in cliques are generally aware of who is in the clique and who is not. Friend lists are one-sided; only o

The problem is that lists don't work both ways. People in cliques are generally aware of who is in the clique and who is not. Friend lists are one-sided; only one person (you) knows who is in the list and who is not. There are no checks in place to ensure that interaction in one group doesn't spill over into another group. In real life, when you hang out with a group of people, everyone else is aware of who you are hanging out with at that moment. Facebook shows this information only to the poster. I am uncomfortable posting a comment on a friend's update that would be embarrassing depending on who else could see it. In a group of friends hanging out this would never be an issue. I suppose there is some asymmetry in real-life social networks, but nothing on the level which Facebook encourages.