I guess it's similar to people saying 'Like us on Facebook' It's a direct call to action instead of 'please come & take a look' It's also a metric that's inst

I guess it's similar to people saying 'Like us on Facebook' It's a direct call to action instead of 'please come & take a look' It's also a metric that's instantly visible, contributes towards popularity, where as page views are not shared nor are they an indication of quality.