Does Facebook automatically upload my photos from iPhone4?

When I take pictures on my iPhone 4 does it automatically upload to Facebook or is there a setting that changes it to auto upload it. Strange question I know haha but when I go on Facebook to post a status for example it shows camera roll… Can someone help answer this question lol?

Umm how about you check the photos on your facebook to see if any of them are from your camera roll? Lol…