Inserted double quote when prepending to the_content

You fixed it by changing the double quote to a single quote. 🙂

<a href="https://wordpress.stackexchange.com/questions/45332/javascript:void(window.open("http://runkeeper.com/share?healthyUrl=http://my_website/my_post_permalink/ " , '' , 'width=630,height=350');">
                                                                                                               ^^^^^

You happened to fix it by refactoring with the “echo” statements. 😀

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