Facebook Privacy – How to Control Who Can See Your Friends List

You can prevent people from viewing your Friend List by following these steps:

• Go to Account → Privacy Settings
• In the Connecting on Facebook section click View Settings
• On the See your Friend List click the box to the right hand side and select Customize
• In the drop down box next to These people select Only Me
• Click Save Setting

I don't think it is possible to prevent the notification being posted to your wall though.

To hide your friends list under Timeline:

1. Go to you Timeline
2. Click on your friends list in the upper box
3. In the friends list window, click on Edit in the upper-right side
4. In the drop-down menu, click on the icon in the upper-right corner
5. In the menu that appears, choose Only Me
   

Using the API is an option when tied into a Facebook app.

SELECT uid2 FROM friend WHERE uid1=me()

That query will only produce user IDs, but that would solve your problem. You can also use the graph API to expand on that if you pick up your own access token.

This query will allow you to find usernames for each ID. Alternatively, you could use the full API to write your own script that will pull a JSON string for you. More details in the link below.

SELECT name FROM profile WHERE id=XXXXXXXX

https://developers.facebook.com/docs/technical-guides/fql/

This page will allow you to run these queries without being logged in. Parsing the data is up to you.

https://developers.facebook.com/tools/explorer