Because 'Like' is more important than 'Look'
More people look at your Facebook posts then 'Like' and 'Share' them. That's a fact that everyone is vaguely aware of, but it might surprise you to know that Facebook tested a feature that would tell you how many people saw your posts, and decided that people didn't want it. According to Facebook engineer Lars Backstrom, the call was made that users wouldn't be interested in how many people saw the content they passed along -- just how many reacted to it. "People are way more interested in seeing *who* liked their posts, rather than just the number of people who saw it," he said in a Facebook post of his own.