Selected answers from the Dumb SEO Questions Facebook & G+ community.
Michael Martinez: LinkedIn has a limit on number of characters you can include. It`s best to use a summary or opening section and link to the main article.There`s no law saying you can`t republish your own content 100 times, but the search algorithms will eventually start ignoring some copies.
Michael Stricker: Jorge, Posting on those platforms is likely to be regarded as a form of self-syndication, therefore it is highly improbable that Google Search will be challenged by duplicate content issues that would in any way confuse or demean the original.
Sam Mah: Of course! Sometimes, the syndicated article can outrank your original article on the certain platforms.