Lead generation often uses digital channels, and has been undergoing substantial changes in recent years from the rise of new online and social techniques. In particular, the abundance of information readily available online has led to the rise of the “self-directed buyer” and the emergence of new techniques to develop and qualify potential leads before passing them to sales.
The likely answer is to do with audience biases. A survey conducted by an email marketing provider is almost certainly going to have different results to one conducted by PPC management tool, as their audiences have different skillsets and biases, skewing the results of their sample. As such, we should take the specific ranking of different strategies in these studies with a pinch of salt.
About the Author: Barry Feldman operates Feldman Creative and provides clients content marketing strategies that rock and creative that rolls. Barry has recently been named a Top 40 Digital Strategist by Online Marketing Institute and one of 25 Social Media Marketing Experts You Need to Know by LinkedIn. Visit Feldman Creative and his blog, The Point. 

Whenever possible, add a personal element to your emails. Most email tools allow you to enter shortcodes that will be replaced with the recipient’s name when the email is sent out. Emails from Treehouse Co-Founder Ryan are always fun and personal. The subject lines are creative, messages are sent "from" Ryan's email address, and the content is personalized. If you reply to the mail, you'll even get a prompt response from Ryan himself!
4. Make Links Clear and Visible & Use Text Links: Make sure that all links to your product purchasing pages are clear and visible. When possible, default to blue, underlined links for easy user recognition. Though in web design it is often unadvisable to use the words "click here" in a link, in email design it typically is more effective to use the words "click here." Make sure that your links are text links and not image-based links as images may not appear in all emails.
With their service, you can choose from a curated list of email newsletters and sponsor those that share your target customer. Sponsoring allows you to advertise your lead generation campaigns in email newsletters that matter to your target audience. LaunchBit screens all lists to make sure they’re legit and handles the transaction from sponsor to advertiser so the experience is smooth for all.
Cost per thousand (e.g. CPM Group, Advertising.com), also known as cost per mille (CPM), uses pricing models that charge advertisers for impressions — i.e. the number of times people view an advertisement. Display advertising is commonly sold on a CPM pricing model. The problem with CPM advertising is that advertisers are charged even if the target audience does not click on (or even view) the advertisement. 
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