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Perhaps a list of witnesses with a link to the post they wish to use as their 'about us' would suffice? I'm not sure people are so confident to leave the site as they would be visiting a steemit link.

Actually it's just a reflexion. The main problem on steemit is that posts cannot be edited after 7 days. An external platform (which would be a basic wordpress blog) would allow us to randomly introduce witnesses, no matter how ranked they are, so it would not influence steemians' votes. Of course it would lead to their 'about us' post here on Steemit.