Now there are massive blocking of Twitter accounts.
Most often, block accounts when you to use mass-following. Blocks is forever!
Also do not use hashtags #ICO #Cryptocurrency etc
Be careful!
If you want to keep your account safe don't use things like mass following that violate the terms of service.
There is a bit of witchhunt against cryptocurrencies so be aware that whatever you do is going to be watched very closely.