This misspelling – and obvious proofreading oversight – was in a June 2, 2013 Forbes article titled, “Book Publishing May Actually Save Itself”. What’s ironic is that the error appeared in an article about publishing! And the misspelled word, which should have been spelled “Hackathon”, was the subject of most of the article.
Forbes’ sales probably won’t decline due to mistakes like this, but books, articles, or publications without as much credibility – especially those just trying to establish themselves – may not fare as well. It’s always best to have your work reviewed by a detached expert.