It's worth knowing about this little bit of deception within Facebook.
If a site has a Facebook Like button, you'll notice a number next to it usually.
That number is not in fact just the number of people that have liked that article on the site, but also includes the number of people that have shared the URL, (including by manually copy and pasting) and also the people who have commented on the item posted within Facebook.
That is to say: A company could post a horrible article, share it to their Facebook page, have 20 people comment beneath the article that it sux and they are offended by it, and the little "Like" button on the article will show a "20", falsely giving the world the impression that 20 people "liked" the article.
Also you could share an item to Facebook with a comment saying "this is absolute trash" and you will increase the "like" count on that article.