Looks like Twitter has been hit with some sort of court order or warning letter. All of Bitfinexed tweets are hidden.
This is all I can see when I try to view that twitter account.
Account suspended
This account has been suspended. Learn more about why Twitter suspends accounts, or return to your timeline.
There's speculation about the reason for the suspension on reddit, but nothing concrete.
https://www.reddit.com/r/btc/comments/7vuzj3/bitfinexed_twitter_got_suspended/