Modify facebook share into share different url

Hello guys, I tried to search for this here and there and no results. I guess it haven't discussed yet


I have a share button in my website page (lets say it is 'PAGE A'). I want it when user click on the share button it will then share PAGE B

How can I do this? Another idea is maybe I fake the share button in PAGE A so when the user click it, it will then visit PAGE B in my website and automatically click the share button there

Any idea for this to work?