Facebook redirect the www.facebook.com link to m.facebook.com link on mobile, but not in the other way. If you share a link start with m.facebook.com, desktop user will be annoyed due to the unpolished mobile web layout of facebook.
This userscript will redirect the m.facebook.com link to porper www.facebook.com link when user visit a mobile facebook link
A userscript management tool such as Tampermonkey is required before using this script.
After install a userscript management tool, click the link bellow to install
INSTALL