How do I completely log out of facebook on my blackberry curve?

I shared a picture from my phone and it made me log on, then share the picture. Well now all of a sudden the pictures from everybodys facebook show up on my phone, and I dont want them there. If I log on to the regular web, sign on, and log out the pictures are still there. I only have 150 MB a month, so I would like to get off so I dont run them up!