It takes quite a bit of effort to create genuinely high-quality guest posts, and many marketers are tempted to find ways to automate the process.
I agree with #rand on this advise: « For your marquee content, your best stuff, I strongly — see how I’ve underlined strongly — strongly suggest using your own site. Reason being, if you’re going to put wonderful stuff out there, even if you think it could do better on somebody else’s site, in the long term you want that to live on your own site. » That’s the way it works and you should be safe !
See on moz.com