Social Share: Edit or delete items, add more

Hello.
Can you please give me a hint:
1) what file should I edit just to delete few social icons in "Social Share" or change order?
2) is it any way to add more (Telegram, Viber, WhatsApp, Skype, ok.ru, etc) by editing file? I suppose it will bi diffucult to make system generate correct link (stream item's link for example).
3) if I'll edit file and replace all "icons" by code from this service https://yandex.ru/dev/share/ is will work, but system still will not detect current link correctly. So seems I need add new services one by one (use original code as example).

Any way I need to know what file(s) to edit

Thanks.