Before you poke someone for the first time, it's nice to know exactly what you're doing. Poking a friend does the following:  Sends your friend a notification saying "(Your name) poked you." Gives your friend the option to poke you back, dismiss the poke, or ignore it. Records the poke on your friend's poke page.  Note: Each poke is only visible to whichever friend you poke. In other words, besides your friend, no one else can see the poke. Poking a friend is easy. To start, just visit the profile of the person you'd like to poke. You can do this by entering their name into the search bar, visiting your Friends page, clicking their name in your news feed, etc. You can only poke friends — you won't get the option to poke on the pages of people you aren't friends with. .." button. At the top of your friend's profile, you'll see a profile picture on the left, a cover photo stretching across the top, and a few buttons on the right side. Look for the one with an ellipses (three dots) on it. Click this button. " This will send your friend a poke notification. Your friend can reply by poking you back or removing the poke. Facebook gives you a convenient way to view all of your pokes at once: the Pokes page. This is available at Facebook.com/pokes. Here, you can see who you've poked and who has poked you. If you've been poking back and forth with a friend, this page will also show how many times in a row you've been poked. When someone pokes you (or you poke them and they poke you back), you will see a blue "poke" button next to their name on your Pokes page. Click this to automatically poke this person back. This is a convenient way to poke lots of people at once without having to visit their profiles.

TL;DR in Vietnamese:
Tìm hiểu xem chọc là gì. Truy cập trang cá nhân của bạn bè. Nhấp vào nút "…". Nhấp vào "Poke (Chọc). Đi đến trang Poke để xem ai đã chọc bạn. Sử dụng các nút trên trang Poke để chọc lại bạn bè.