We run three blogs (tumblr with our own domain, wordpress hosted and blogger hosted). We publish a small article every day, and basically we post the same article and photo across all three blogs, with links back to our main website.
Would this be classed as content duplication? Do you think we would be better off rotating the blogs, so that each one receives a unique post every 3 days?
On another note, would we benefit from using different domain names for our Wordpress and Blogger blogs?