Very well-written response. But I disagree with the answer to question number 3. Facebook can predict what you will like in the future based on what you like in the past. You are a predictable person. What you liked last week, you will like again next week.

Let's say there is a particular friend who you always like their posts or comment on their status updates. This friend posts once per day, and you comment on that post every time.

Facebook will show you that friends post each time. That friend is obviously important to you.

Let's say another friend posts 20 times per day, and you never like or comment on their posts. Facebook will hardly ever show you those posts, except when they think a friend that you follow closely has liked or commented.

To take it to another level, let's say you use the Facebook Check-In function to check into coffee shops and you Like Starbucks. Do you think Starbucks posts will appear more often in your feed? You betcha. You've shown interest in coffee.

And if you make a status update using the word coffee?

You get my point. Facebook knows more about you than Google does. They are doing a pretty good job of making the comment about search intent (which Google owns) moot.