Facebook privacy settings?

[NtG]

so i have recently realised that if i comment of a friends photo this comes up in all of my friends news feeds[ even if they are not mutual friends with the persons photo i commented on]
so i am assuming everything i post on facebook appears on all of my friends news feeds. does anyone know exactly how to change this? i h had a look in the privacy settings but am not sure
thanks to anyone who can help

[Talha Amjad]

ITS TOO SIMPLE MAN JUST LOG ON TO http://www.facebook.com/help/privacy.
U WILL GET ORIGINAL INFORMATION!

[Daniel]

you Cant Not Restrict What you Comment on other Peoples Items That is Beyond your Control What Ever your Friends Privacy Settings Are is What Will Show to other People