How can I prevent the posts of friends of Friends in Facebook? I really don't care to see all the garbage some of these people post.
Posts by Friends of Friends will not normally appear in your News Feed unless one of your friends (or someone that you subscribe to) comments on or likes the post, and the post is visible to you.
If some of your friends (or subscriptions) frequently comment on or like posts that you do not want to see, hover over one of those posts in your News Feed, click on the ∨ that appears in the upper right corner of the post, then click Unsubscribe from comments and likes by _____.
Then you will no longer see posts in your News Feed just because that person commented on or liked the post.
Also make sure that you are not "Subscribed" to the "Friends of Friends" you are talking about.