This new functionality will let the blocked users to know the user who blocked them. From this functionality, they can know the reason and if they were able to convince the blocking user, their account may be unblocked by the blocking user.
If you find any vulgar account or a spam Twitter account, you can report the user or block him from your list. The same happens when you unfollow a particular account. For better understanding, go through Reporting Spam on Twitter and Blocking Users on Twitter.
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Amazon: Hatching Twitter: A True Story of Money, Power, Friendship, and Betrayal (Nick Bilton) [$15.42]
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