This topic seems actually quite controversial. Google answered the question by what could be taken as a denial. But their answer was kind of open to interpretations. And on the other hand, there are studies (one of them from Moz) that showed linking out has an impact. So, how can you be so assertive? Is it something that comes out from your own experiments?
Would you mind sharing your stumbleupon user name with me? I would love to follow you and your shares! :) I am beginning to get more active on SU and it is definitely paying off. I have had a few posts in the last several weeks that have brought in 600-700 visits each. :) In regards to your "challenge" I am going to try out paper.li I will let you know how it goes.
When you run an email marketing campaign, we hope you're including links in that email that lead recipients back to your website -- to read more content, convert, whatever. When you take a look at email marketing as a source of traffic, you'll be able to see how much traffic is sent to your website due to email marketing campaigns you've sent out. That's how we found out, for instance, that driving blog email subscriptions was extremely important to the growth of a business blog -- because many of the visits we receive each month come from subscribers who get pinged in their inboxes that a new blog post is published, prompting a click through to the post! Just be sure to include tracking tokens in the links of your email, otherwise the clicks won't be properly bucketed under the email marketing source.
Secure (https) to non-secure sites (http): Since Google began emphasizing the importance of having a secure site, more websites are securely hosted, as indicated by the “https” in their URLs. Per the security protocol, however, any traffic going from a secure site to a non-secure site will not pass referral information. For this issue, you can correct by updating your site to be secure through a third-party SSL certificate.