as far as I am aware there is no scroll down event, there is just a big page and it lets you scroll down it. At the bottom of your facebook page is a link to show you older data.
Unless you implement your own scroll bar that is.
The only way to get more data without refreshing the page is ajax as the previous poster mentioned.
And you need to calm down and
EaseUp, the people on here are doing it in their free time (or compile cycles) and being hassled or informed it is urgent is not going to make any difference.