In Russia we use Vk, Instagram, Twitter and Tiktok. Vk is like a Facebook. We can chat there, listen to some music, read news and make posts about everything. Its so convenient platform for everyone who lives in Russia. Foreign people also can use it, for example some famous singers from USA have their official accounts (Halsey, Ashnikko and etc.). But I can say that for foreign people there is no strong reasons to use it if they don’t live in Russia, because the most groups write everything on Russian and there are not so many foreign people.
For messages we use WhatsApp and Telegram.
Also for mails we have Mail.ru and Google.com.