To delete messages on Facebook, you will have to open the individual message, go to choices and start choosing the message you want to erase. If you have lots of messages, the procedure can be really lengthy. Otherwise, you can just get rid of the messages from the message list, however doing this will not eliminate the message completely. Rather it will be archived, and will come back when the person sends you a new message.
Here's where we bring in some assistance i.e. 'Facebook Fast Delete Messages', an extension for your Chrome web browser that will enable you to erase Facebook messages with a single click.
The process is easy. Open your Chrome web browser and browse to the plugin. Click "Add to Chrome" in order to download/install the plugin. It presently has over 82,000 users and I discovered it to be virus/bug-free as of two weeks back, so I can extremely recommend it.
How To Delete All Facebook Messages
Once it's set up, simply sign into Facebook. Open the full messages window and click the plugin icon that sits on the far right of the address bar.
Then click "Release". It will erase all the messages on that whole page. If you have a lot of old messages you may have to scroll down and click Introduce a few times until they're all gone.
However within a couple of minutes you need to be rid of all your old conversations, and they will not come back when the person messages you once again. You'll have a tidy slate!
Thus the article How To Delete All Facebook Messages from us, hopefully useful thank you.