How to stop friends from seeing "liked" posts from public FaceBook pages?

[Abdullah]

Hide your recent activity on Facebook.

Remove recent activity stories by clicking the X that appears to the right of the story when you move your mouse over it.

If you want to prevent people from seeing a recent activity story about a change in your basic info (ex: changed relationship status):
Click the Edit (Update Info) button in the top right corner of your profile (timeline) and find the field you want to edit. Before you edit it, choose Only Me from the privacy audience selector.
Make the change and then view your profile (timeline). You may see a story about it, but because you selected Only Me this story is only visible to you.
Delete the activity story from your Wall (timeline).
Go back to your Edit section and change the audience of that section back. Because you deleted the story from your Wall (timeline), they won't see a story about the change you made.