If you mean there chats with other people you need to have acess to their account and can only view recent chats with conversations they have left open.
but if you mean conversations you have had with your own friends then you need to open a conversation with them when there online and hope that the chat is still logged.
You can't unless you are chatting with them. That is the only conversations you will see, the ones between you and them.
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
ES
Yes they do
no
That depends on the privacy settings used.
See what? Be specific
it currently does not exist
To chat with friends on Facebook, you can use the Messenger app or the Facebook website. Simply log in to your account, locate the friend you want to chat with by searching their name or finding them in your friends list, and click on their profile. From there, you can send them a message directly through Messenger or use the chat feature on their profile. You can also create group chats to include multiple friends in the conversation.
Yes.