Vertical scroll down navigation for Facebook app?

1. How do I scroll down on my Facebook page?
2. What does a scroll bar do?

How do I scroll down on my Facebook page?

To scroll through your News Feed, just use j to scroll down and k to scroll up. To comment on the selected story from your News Feed, use c. To like or unlike a selected story, use l.

What does a scroll bar do?

A horizontal scroll bar enables the user to scroll the content of a window to the left or right. A vertical scroll bar enables the user to scroll the content up or down.