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Why though? Messages could still be private between those in the conversation, or there could be more options for Message privacy settings like specifying who and who can't message you. It would at lease make it more manageable for bigger accounts.

The whole point of steemit is that all the posts and comments are on the block chain, free for everyone to see and can be voted on. Even when you edit your posts the old text is still on the blockchain. It's still a good idea that a third party could develop and you could put your steem IM name in your profile for people to contact you.

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