Facebook has feature to create and maintain custom "friend list". The purpose of 'friend list" is to share with spesific list of friends.
For example, you have friend lists contain
1. list of college
2. list of family
3. list of gamer
4. list of office friends
5. etc
By default, when you add a new friend or accepting a new friend, he/she will be member of "Friend" list. You can not remove a member from "Friend" list.
A friend can be member from some list. For example Mr Foo can member of gamer and college.
When we post something, there are 5 targeted audience:
1. public : to view worldwide
2. friends : only facebooker that is your friend.
3. friends except... : only facebooker that is your friend without some friends that you excluded.
4. only me : only you (to keep personal)
5. see more : where you can pick custom list. Only one list you can select.
To create custom "friend list" (on PC)
1. sign in using pc
2. from your feed, Friend -> see more.
3. Custom list -> create list
4. fill the name of list and confirm.
5. you can start to fill the custom list.
How to put/remove a friend in custom list on android
1. search your friend and open his/her profile.
2. tap "Friends" -> "Edit friend list
3. select/check friend list to add friend. you select/check more then one. for example, you check game and college. or you can remove a friend from list friend vy unselect/uncheck it.
4. click back button to save it.
when you need, to post something for specifif friend, change audience from public/friends to see more, then select list friend you prefered.
tips:
it is hard to maintain friend list if member so big, ie more then 100. we suggest:
1. create friend list only for spesific purpose that required privacy. for example family, office, college, etc.
2. when you add/accept your spesific friend, immediately put he/she into your list friend.