How to implement a share button for social networks?

Question

Social media

How to implement the "Share" button for VK, classmates, facebook and twitter? How does this even happen?

Answer 1

All social networks have an API. Read the documentation - write your own button.
There are also embedded widgets, you can use them. For example, for VK https://dev.vk.com/widgets/share
Or use the boxed all-in-one solution, as suggested above.

Answer 2

Hold:
https://yandex.ru/dev/share/#share