You go to their profile and from there you go to their groups tab and you can view all of the groups they are a part of. Usually you have to be friends with someone to see what groups they are in.
No only your firends can see them. If you are talking about people of Facebook which you are no friends with then no. Your friends that do not have facebook can not see your profile or posts.
You can see your friends' posts on Facebook if they accept your requests to be their friends.
The original purpose of facebook is to communicate our friends and to see the information of of your friends
See what? Be specific
That depends on the privacy settings used.
If they have set their photos to a private/friends only setting then you will only be able to view them if you are friends. Some people do actually have private groups of photos where only some people are allowed to see them.
you can chat with friends and see what their up to.
There is no way to see a mutual friend friends on Facebook if their Facebook is private. You will need to add the person to see their profile.
It means they have customized their privacy settings so you can't see anything they do on facebook, but you are still one of their facebook friends.
Facebook friends, the people you accepted or added. They are the ones that can see your profile and updates. Peeps is just another word for friends.
no you can't on instagram but can on facebook