Twitter removes dumb Direct Message feature a month after release

From TheVerge:
  
Twitter quietly removes feature that lets you receive direct messages from any follower

Only a month after rolling out the feature, Twitter has quietly removed the ability for users to receive direct messages from any follower. For now, the person you want to DM will need to follow you back before you share any private thoughts.
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What could possibly go wrong?  I'm glad they realized the problems relatively quickly. How could they do this in the first place?