Did you read about the statement of Matt Cutts to the guest blogging topic?
“So stick a fork in it: guest blogging is done; it’s just gotten too spammy. In general I wouldn’t recommend accepting a guest blog post unless you are willing to vouch for someone personally or know them well. Likewise, I wouldn’t recommend relying on guest posting, guest blogging sites, or guest blogging SEO as a linkbuilding strategy.”
Google want to see high quality – but how will you able to control quality? The solution is easy: Continue reading