Make sure your content is worth sharing and that you're actually phrasing it in terms that are useful for their followers/fans. (otherwise you're goign to come off ungeniune and spammy) In all fairness to, you'd want to develop relationships with the most influential rainmakers, ask them up front if there is anything you can do to help them out. Most of the time just asking is enough to impress them and develop a good rapport.
Guest blogging is a fantastic way to spread your brand to new folks who've never seen your work before, and it can be useful in earning early links and references back to your site, which will drive direct traffic and help your search rankings (diverse, external links are a key part of how search engines rank sites and pages). Several recommendations for those who engage in guest blogging:
Don't be discouraged if you ask and get a "no" or a "no response." As your profile grows in your niche, you'll have more opportunities, requests and an easier time getting a "yes," so don't take early rejections too hard and watch out - in many marketing practices, persistence pays, but pestering a blogger to write for them is not one of these (and may get your email address permanently banned from their inbox).
Did you know that organic engagement is highest on Facebook when posts contain videos? Or that simply including the word “video” in your email’s subject line can increase open rates by 19 percent? One company went as far as to test whether video thumbnails in an email newsletter would increase engagement and they found that it was quite successful. They reported that nearly 41 percent more people engaged with the email if it had a video thumbnail, as opposed to a static image or just text.
Focus on your design. The first thing people notice when they visit your blog, is the way it looks. And although the old adage goes that one shouldn’t judge a book by its cover, the same isn’t always true for a blog. If you want people to stay on your blog, you’ve got to hook them with an eye-catching design; once they’re interested in the appearance, they’ll start reading to see what you’re all about.