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Not much to add to Sean's answer, except make SURE that what you want them to link to is worth it! Ideally, you'll have an angle, such as something the competitor doesn't. Even better, a new feature that the blogger could write about, to give them some 'juice' for their article. Remember to think like them - What can you give to them, to help them make their piece of content better. To get what you want, you really need to figure out what they want