Why to add a Facebook Like box to your blog / website?

Why is important to add a Facebook Like box to your blog / site?

a. all the people who liked you page will be notified every time you will post a message or anything else to your Facebook Page. This way, you will increase the number of visits;

b. your friends can share or comment your articles from their timeline, so other people will find out about your articles. Also you will gain an important number of visits;