mobile-safari-fixed-animate.js

$.isMobileSafari = function(){return navigator.userAgent.match(/AppleWebKit\/(.*)Mobile\//);}

if ($.isMobileSafari())
{
    $("#facebook").hide();
    $(document).bind("touchstart", function()
    {
        $("#facebook").hide();
    });
    $(window).bind("scroll", function()
    {
        var position = (window.pageYOffset + window.innerHeight);
        $("#facebook").show().css("top", position).animate({top: position - $("#facebook").height()}, 150);
    });
}