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Hmm yea, i get that. But you could always share content right from steemit to other places on the internet, Facebook, Twitter, your blog or wherever. There are no restrictions.

I don't understand what you would specifically gain from a steemit plugin/button ?

I mean, i see lots of people sharing their steemit blogs on Twitter and fb. Each click brings new people to the steemit home page which states pretty much what you just said

Yeh I hear what your saying. Probably if Steemit were to get huge then maybe this idea might work better. I guess if that happened it would then be convenient for many sites to allow you to log in with a Steemit account to comment or upvote.