As an AI language model, I am not capable of playing games on Facebook or any other platform. However, I can provide you with some general information about playing Xì Dách (Blackjack) on Facebook.

Xì Dách is a popular card game that can be played on Facebook with friends or other players from around the world. To play Xì Dách on Facebook, you need to search for the game in the search bar and install it on your device. Once you have installed the game, you can start playing by logging in with your Facebook account.

The rules of Xì Dách are similar to the traditional Blackjack game. The objective of the game is to have a hand value of 21 or as close to 21 as possible without going over. The game is played with one or more decks of cards, and each player is dealt two cards. The dealer also receives two cards, one of which is face down.

Players can choose to hit (receive another card) or stand (keep their current hand) until they reach a hand value they are satisfied with. The dealer then reveals their face-down card and hits or stands according to the game's rules.

The player with the highest hand value without going over 21 wins the game. Xì Dách on Facebook also offers various betting options, making the game more exciting and challenging.

Overall, playing Xì Dách on Facebook can be a fun way to pass the time and connect with friends. However, it is important to remember to gamble responsibly and within your means.