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Being honest, I'm not the first proposing this. The first plugin/button proposal may be actually this one:
https://steemit.com/steem/@nextgencrypto/request-for-proposal-steem-wordpress-plugin
I don't know (I'm new here) if it makes sense to upvote this proposal at it was made in April. But I want to share it to give credits to the authors and to encourage them to continue.