Blackberry questions

Okay don't hate on me this isn't iPhone/Android vs. Blackberry, I just need some answers because I have a blackberry.

Okay here's the questions (+rep for helpful answers):

1. How do I get the Facebook 'app'? I can get onto FB via my WiFi but I want to use the proper app because it has a better layout etc.

2. How do I find people who've added my pin? My mate says he's added it but I can't find the invitation.

3. Is there anything else I need to know?

Oh, and how much is about 50kb of data accidentally on 3G... o.o

App world

go to bbm and scroll to bottom

50kb is nothing

Okay thanks, Oleh. Where's app world?

I had to download it via Wi-Fi from the Blackberry store online!

Ugh I have to wait until I get it activated to do that then. Thanks :)

Yeah, you'll need to wait for BIS to be activated before you can use fb, app world, and bbm. :)