Most of the users on Facebook used to chat and search for something. They know that their chat history is being saved and they know how to remove the old chat history as well. Do you know that search history is also being logged ?
Yes, not only chat history Facebook will log all the search history, like, comment, .. they log everything whatever you do on Facebook. One good thing is it is by default visible to you. If you need to show any thing to specific people it is configurable.
