To delete messages on Facebook, you will have to open the private message, go to choices and start choosing the message you wish to erase. If you have numerous messages, the process can be extremely time-consuming. Otherwise, you can simply get rid of the messages from the message list, however doing this will not remove the message completely. Instead it will be archived, and will come back when the individual sends you a new message.
Here's where we bring in some help i.e. 'Facebook Fast Delete Messages', an extension for your Chrome web browser that will allow you to delete Facebook messages with a single click.
The process is basic. Open your Chrome web browser and browse to the plugin. Click "Include to Chrome" in order to download/install the plugin. It presently has over 82,000 users and I found it to be virus/bug-free as of 2 weeks earlier, so I can extremely suggest it.
Facebook Delete All Messages
Once it's installed, simply sign into Facebook. Open up the complete messages window and click the plugin icon that sits on the far right of the address bar.
Then click "Introduce". It will delete all the messages on that entire page. If you have a great deal of old messages you may have to scroll down and click Launch a couple of times until they're all gone.
However within a few minutes you ought to be rid of all your old conversations, and they will not reappear when the individual messages you once again. You'll have a clean slate!
Thus the article Facebook Delete All Messages from us, hopefully useful thank you.