How It Works
The format for a m.me link is as follows where PAGE-NAME is the Facebook Page linked to your messaging app.
http://m.me/PAGE-NAME
When a person clicks an m.me link, they will be redirected to either a new conversation with your business or an existing conversation if the person has messaged your business in the past. A default message will appear in the conversation stating: "You have entered this conversation by following a link. We've let PAGE-NAME know you're here."
Here is an example: http://m.me/Surplussystems