Many many people who post on f...book, professionally, notice this.
F...book limits the number of people it shows any given post to. They said, if we showed everything to everyone, it would be too much for you to read.

Always include a photo! If you do, your post will reach 2 or 3x as many of your friends.

And now, for some proof. I have a blogger friend I follow religiously. He posts from 3 places: f...book, twitter and twitter, so that three posts end up created on f...book. I go and "like" every one of his posts to help his message be known.

And every day! I have to go to his wall, to get all the posts. He puts out 3 a day, and I usually only see 1 or 2. There have been a couple times of 0, but since I like everyone of his posts, so that usually doesn't happen.

Remember, what you see on F...book is not what other people see. It is ingenious. Plausible deniability to the max. You put out something, and you have no idea what it looks like on the other end. And most people never notice a few things missing. As long as everything looks normal.