When i'm on youtube for facial exercises will this work for getting rid of double chins?

For weight loss ...: You cannot target specific areas for weight loss - if you have adipose tissue to lose (not everyone does), then consider an increase in cardio and a balanced diet. However, do not always do the same exercise or you will increase your risks for stress injuries. Mix things up with walking, running, biking, swimming, elliptical, or circuit training. Ultimately you need to burn more than you consume.

No: No, those "facial" exercises will not work alone. You need to have full body workout and full body weight loss as your face will not noticeably lose weight compared to the rest of your body.