I've got a Facebook question?

[Greta]

I want to manage some stuff on facebook, but I don't know how. I had this sidebar thing which shows me stuff like "He liked a photo" or "She commented on a photo". It was on the top of the online friends sidebar (My facebook doesn't have the latest update). You could scroll down and see more stuff. But now the thing is gone, I can only see my online friends, but I don't know how to turn on the thing that shows me what my friends liked, commented on and etc. Does anybody know what I'm talking about? How do I bring it back? Thanks