Blocked accounts cannot:
* Follow you
* View your Tweets when logged in on Twitter (unless they report you, and your Tweets mention them)
* Find your Tweets in search when logged in on Twitter
* Send Direct Messages to you
* View your following or followers lists, likes or lists when logged in on Twitter
* View a Moment you’ve created when logged in on Twitter
* Add your Twitter account to their lists
* Tag you in a photo
(Quelle: https://support.twitter.com/articles/117063 )