In regards to the Facebook "Ticker" to the right of your Facebook page... If you're able to see your friend's "Mutual Friend's" posts, then you need to inform their "mutual friend" that they have to go into their privacy settings and make sure their settings for wall posts, comments, etc.. is set to "Friends Only". If this setting is set to "Friends of Friends", or worse, then anyone in the "Friend Chain" will be able to see someone else's wall posts. This can be verified afterwards by going onto the said person's wall to see if you can still view their wall comments/posts.
I've gone through a few random people's profiles that I don't even know (but are mutual friends with someone I know), and was able to see their wall posts, and in some cases, actually had the opportunity to post to their walls. This is very dangerous. A well programmed bot or person with ill-intent could post spam-links or links leading to malware to spread badness all over Facebook.
--ma
Michael
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