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You didn't hear of it before? It has been all over SteemIt this last month. This is my 4th post about it, that's how good I think the concept is.

First you connect your Twitter, Instagram and/or YouTube account from within the Share2Steem website.
Then, whenever you want a post you make on one of those sites to appear on your SteemIt blog, you just add the hashtag #share2steem to it.

Posts without that hashtag aren't shared on the Steem blockchain, so you can be selective.

Posted using Partiko Android

Interesting concept for sure.