To erase messages on Facebook, you will need to open the specific message, go to choices and begin choosing the message you want to delete. If you have many messages, the procedure can be extremely time-consuming. Otherwise, you can simply get rid of the messages from the message list, however doing this will not eliminate the message permanently. Instead it will be archived, and will come back when the individual sends you a new message.
Here's where we bring in some assistance i.e. 'Facebook Quick Delete Messages', an extension for your Chrome browser that will permit you to erase Facebook messages with a single click.
The process is easy. Open up your Chrome web browser and browse to the plugin. Click "Contribute 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 ago, so I can highly suggest it.
Delete All Facebook Messages
Once it's set up, simply sign into Facebook. Open up 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 great deal of old messages you might have to scroll down and click Introduce a few times up 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 reappear when the person messages you again. You'll have a fresh start!
Thus the article Delete All Facebook Messages from us, hopefully useful thank you.