"LONDON (Reuters) - Twitter Inc is to ban most advertising of cryptocurrencies on its platform, joining Facebook and Google in a clampdown on the nascent industry, the company said in a statement." - Reuters Editorial
You also can go to this link and check it out: https://www.reuters.com/article/us-crypto-currencies-twitter/twitter-to-ban-cryptocurrency-adverts-on-its-platform-idUSKBN1H222H