Posts with more likes and comments by a lot of your friends, will more likely show up on your feed.
As opposed to some random store hole in the wall store you follow/like that has made an update about their store hours closing and has gotten one or two likes with no comments.
It kinda sucks because I would want to see all updates from all friends/likes, but I think that's overdoing it. I've been on FB since you still needed a ".edu" e-mail address and I've accumulated a lot of liked pages. It might take awhile to scroll through my "likes"