To erase messages on Facebook, you will have to open the specific message, go to options and start choosing the message you want to erase. If you have many messages, the process can be very time-consuming. Otherwise, you can merely get rid of the messages from the message list, however doing this will not get rid of the message completely. Rather it will be archived, and will reappear when the individual sends you a new message.
Here's where we generate some assistance i.e. 'Facebook Fast Delete Messages', an extension for your Chrome web browser that will allow you to erase Facebook messages with a single click.
The process is easy. Open up your Chrome browser and browse to the plugin. Click "Contribute To Chrome" in order to download/install the plugin. It presently has more than 82,000 users and I found it to be virus/bug-free as of 2 weeks back, so I can highly advise it.
How To Delete All Facebook Messages At Once
Once it's installed, 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 delete all the messages on that entire page. If you have a lot of old messages you might need to scroll down and click Release a couple of times until they're all gone.
However within a few minutes you must be rid of all your old conversations, and they will not reappear when the person messages you again. You'll have a fresh start!
Thus the article How To Delete All Facebook Messages At Once from us, hopefully useful thank you.