1. https://www.investinblockchain.com/constantinople-st-petersburg-are-here-ethereum-users-adopted-updates/
2. https://www.trustnodes.com/2019/03/01/swiss-bank-launches-crypto-token-on-ethereum-in-a-first-of-its-kind
3. https://btcmanager.com/facebook-coin-due-within-six-months/
4. https://gorodfinansov.ru/vtoroj-mezhdunarodnyj-forum-po-majningu-terracrypto-sostoitsya-v-moskve-14-marta.html
5. https://www.ccn.com/facebook-whatsapp-cryptocurrency-listed-exchanges