With recent changes in Facebook, some users may have the rare problem where you cannot add a friend to an existing friend list. Facebook will show the friend as added, but your changes are not saved. A basic solution is given here.
Updated: Disable Facebook Instant Personalization Pilot Program
Facebook has recently begun to roll out their new "Improved Privacy Controls". This changes how some privacy settings are accessed on the Facebook website. A previous article on TechUserFriendly.com dealt with how to change Facebook’s Instant Personalization Pilot Program privacy settings, so that it would be disabled for your account. But depending on if Facebook has applied these "Improved Privacy Controls" to your Facebook account, those instructions may no longer apply to you, and instead the instructions below may be applicable.
How To: Disable Facebook Instant Personalization Pilot Program
A recent new feature from Facebook is the Facebook Instant Personalization Pilot Program, which acts to personalize your visits to other selected partner websites such as MicrosoftDocs.com, Pandora, and Yelp. To get greater control over your online privacy in relation to Facebook, you may choose to opt-out of this program. If you do not want this feature activated, then you can disable it through the Facebook Privacy Settings, using the steps shown here.
How To: Hide Your Facebook Friends List On Your Profile
With recent changes to Facebook’s privacy settings, you can once again hide your Facebook Friends list, so that no one else can see who your Facebook friends are from your profile page. Facebook has gone through many changes to their privacy settings and policy over the past several months. For a while, you could not completely hide your Facebook Friends list from people who had access to your profile page. But now, you can prevent others from viewing your Friends list if you wish.