url to open facebook messenger app if installed, else open web messenger [closed]

Question

I am looking for a single url to open facebook messenger chat session across different devices:

• On mobile, if fb messenger app is installed, it opens fb-messenger://user-thread/
• On mobile, if fb messenger app is not installed, it opens http://m.me/
• On desktop, it opens http://m.me/

Example: For Google map, I just need use href="http://www.google.com/maps/place/{{lat}},{{lng}}", it will automatically open Google map app if installed, else it open google map on browser.

Answer 1

http://m.me/<FACEBOOK_PAGE_USERNAME>

For example:

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