facebook privacy help?

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Okay so basically, I want to be able to post on someones wall and comment on their things but i dont want my other friends on my facebook seeing what i am saying and viewing my conversation on someone elses wall.. is there any way to hide what you send to other people or keep it from showing up on feeds?

[abraXus]

the only way would be to add all of your other friends to your restricted list so your activity wont show to them in their ticker

http://abrax.us/Facebook/RestrictedList.php

but then they wont be able to see any of your status updates then either

instead just send the person a private message and you wont have to worry about all that - dont use someone's wall to communicate privately with them

[Karen]

Simply while posting under the share option get into the gear icon appearing to do the custom settings. In that under hide from this option feed the name to whom you want to get the update hidden.
So now the post and updates in regards with it will remain hidden to those selected by you.