I think what you're talking about was an option at the bottom of the feed which allowed one to see everything everyone's posted. Unfortunately, upon making the feed endless, this option is no longer available.

Is there an easy way to choose who sees a particular post (ie, the way one sees a display of friends to click on when inviting them to an event)? They should implement this, allowing for deselecting unwanted viewers (rather than selecting for wanted viewers - for those with too many friends).