Users can override this setting in Skype for Business by going to Settings > Tools > Options.
To delete messages independently click “Actions” and select “Delete Messages”. You can either delete messages one by one or delete all Facebook chat messages together.Select any friend to delete your chat messages with him.On the left side panel on Facebook you can see “Messages”.Steps to Permanently Remove Facebook Message History Below are the simple tips that you can quickly follow to delete chat history on Facebook on the web. Still you can easily remove the chat history on Facebook. Update: The plugin seems working for some users and also there is an alternative plugin to do this. Unfortunately it does not work anymore due to the Facebook latest updates. On Google Chrome there was a very useful extension to delete all Facebook chat history with ease. You can permanently remove Facebook chat messages. Right? Spend sometime on Facebook to check your chat history. Once we log in to Facebook we start reading new posts, like or share some of them and start to respond to a message. Everybody does keep chat history on Facebook without touching on it.
I don’t think you will like to keep your months old Facebook chat history intact for years.