Facebook is a social network that is very popular throughout the world. In the modern era, the internet is often told as the 6th basic need of humans. Almost all internet user has a Facebook account. Facebook was invented by Mark Zuckerberg, a former student at Harvard University, in 2004. Gradually, it becomes more popular. In March 2020, it was found that there are 37,912,000 Facebook users in Bangladesh which is 22.1% of the total population. One can open an account on Facebook and can add his friends, families, and peers. He can also upload images, videos, and share his thoughts on his wall. People can easily connect with each other via Facebook. Many people also have found their old friends using Facebook. It has made communication very easy. There are also many groups available on Facebook. One can easily join a group that matches his interest like a group of book worms or movie lovers. Facebook also has made e-commerce and online business easier than ever. Many small entrep...