facebook

That you cannot do. Facebook doesn't postback the details of the submission or the success.

For more please go here: https://developers.facebook.com/docs/plugins/share-button

when user click facebook share button.that time i need a message from facebook in my website.

How do you want to track that website link? You can use the Facebook share button to track how many times that website is shared. But, I don't understand how to track the website link?!