Tap the Facebook app icon, which resembles a white "f" on a dark-blue background, to open Facebook. This will load your News Feed if you're already logged in. If you aren't already logged in, enter your email address and password before continuing. It's in either the bottom-right corner of the screen (iPhone) or the top-right corner of the screen (Android). Some Facebook app versions have a three-by-three set of dots instead of the ☰ icon. This icon resembles a pair of blue, person-shaped silhouettes. Anyone appearing near the top of the page is someone that Facebook has determined to be one of your best friends.  People further down the list are friends with whom you haven't interacted as much as people near the top. A good rule of thumb is to consider the top five to ten people in this list as the people to whom you are most connected. This takes into account your interactions with them, but not necessarily their interactions with you.

TL;DR in Vietnamese:
Mở Facebook. Chạm vào ☰ ở bên dưới góc phải màn hình (trên iPhone) hoặc phía trên góc phải màn hình (trên Android). Chạm vào Friends (Bạn bè) với biểu tượng hai bóng hình người màu xanh dương. Xem danh sách bạn bè của bạn.