What do you think about "micro-business", e.g. selling of Wou Wou/Ellure masks/detox drinks and other products on Instagram/FB? Do you think it is a good form of side income?

In my opinion it is a bad idea. Selling in the mirco economy is still a very hard thing for a experience person . So you can imagine the struggle a fresh person like you and I to experience.An advice I was given by a person was to ask yourself this simple question which is do provide value to your customers . Many of the product can be easily sold on a third party website and you are just like a unnecessary middle man. So to stand out from the crowd it is advisable somehow provide value to the product which you are selling to your customers.

No, avoid it...
Most of the products do not have research or article proving the effectiveness. These products are expensive and people who said they work is likely because of the placebo effect(cognitive bias).

Many small social media influences sell these products. They gain sales just because they are quite “popular” and many people trust them.

These micro business operate like MLM. The product is expensive which means the high commission the seller get.

Although it’s legal, it might not be ethical. At the end of the day, buyers are at the losing end.