Some Trading Platforms May be Excluded from the Ban
Report 9 April 2018

https://news.bitcoin.com/report-twitter-prepares-ban-on-crypto-ads/

Twitter is reportedly preparing to prohibit advertisements for ICOs, token sales, and cryptocurrency wallets. The new advertising policy is expected to come into effect in a couple weeks. The microblogging site is said to impose a ban on ads for crypto exchanges, as well, bar a few exceptions. The policy change is yet to be confirmed officially.