Facebook is the most popular social network today. Facebook has sales, direct, calling, messaging features for people far away, can connect with foreigners. On Facebook there are many non-profit teachers directly to teach students across the country, it's very helpful for students who don't have money for extra lessons, they can study there. On the other hand, some students based on it have posted many gentle and vulgar articles with hinting nature. From that was born the school lwacj. Fortunately, Facebook has a feature to report posts and can block the accounts of people within the limits set by Facebook. Again, Facebook has a good side and a bad side, that's for us to decide, or try to learn better.