HOT NEW NEWS: IM Chat on the Facebook

I just opened up my Facebook to see this new addition:

HOLY HELL Facebook
I don't know if I like it yet. I mean, I go on Facebook to perve on everyone. I look at their photos, see who's written on their walls and look at their friend collections.
I don't want them to know when I'm online and chat to me. Facebook is more the medium whereby you can stay in touch with someone without really staying in touch. A beautiful thing in many ways.
I'll see how it goes, but I'm thinking it will be more of a hindrance.