html2facebook

    function canvasToBlob(canvas) {
        var imageBase64 = canvas.toDataURL();
        var imageBinaryString = atob(imageBase64.split(',')[1]);
        var imageBinary = new Uint8Array(imageBinaryString.length);

        for (var i = 0; i < imageBinaryString.length; i++) {
            imageBinary[i] = imageBinaryString.charCodeAt(i);
        }

        return new Blob([new Uint8Array(imageBinary)], {type: 'image/png'});
    }

    function canvasToLocalFile(canvas, filename) {
        var link = document.createElement("a");
        link.href = canvas.toDataURL();
        link.download = filename;
        link.click();
    }

    function canvasToFacebook(canvas) {
        FB.login(function(response) {
            var accessToken = response.authResponse.accessToken;

            var fd = new FormData();
            fd.append("source", canvasToBlob(canvas));
            fd.append("access_token", accessToken);
            fd.append("message", "This is my university timetable, generated on http://unibuddy.com.au/");

            $.ajax({
                url:"https://graph.facebook.com/me/photos?access_token=" + accessToken,
                type: "POST",
                data: fd,
                processData: false,
                contentType: false,
                cache: false
            });

        }, {scope: 'user_photos,publish_actions,publish_stream'});
    }

    function htmlToFacebook(node) {
        html2canvas(node, {
            onrendered: function(canvas) {
                canvasToFacebook(canvas);
            }
        });
    }