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What happens if I have both my tweets posting to my blog as posts and my posts sent to Twitter? Will it cause the world to end in a spinning fireball of death?

Actually, Post to Twitter has taken this into account and you can safely enable both creating posts from your tweets and tweets from your posts without duplicating them in either place.

Anything else?

That about does it - enjoy!

--Nauro Rezende Jr

http://www.idmarketing.com.br/post-to-twitter/