gistfile1.js

$.getScript('//connect.facebook.net/en_UK/all.js', function(){
        FB.init({
            appId: 'APPID',
            channelUrl: '//siteurl.com/channel.html',
        });

        $("#some-btn-id").click(function () {

            FB.ui(
                {
                    method: 'feed',
                    name: 'Title of the share',
                    link: 'http://example.com/',
                    picture: 'http://example.com/logo.png',
                    //caption: 'Reference Documentation',
                    description: 'Description body text for the share'
                },
                function(response) {
                    if (response && response.post_id) {
                        
                    } else {
                        // post was not published...
                    }
                }
            );

            return false;
        });

    });