Social proof is the psychological idea that people determine what’s correct by finding out what other people think is correct. Customer reviews are 12x more trusted than descriptions that come from manufacturers. Social media is a powerful tool for creating social proof. Let the stories and experiences of your happy customers create converting content for you.
Blog posts: This tactic employs the principles of content marketing by offering educational articles of interest to your target audience. They’re designed to give advice or helpful insights on topics related to your business or industry, and consequently, draw consumers to your site who are interested in this information. These educational, informative posts also showcase your company’s knowledge and expertise, building your brand with the target audience.
Much of this is steeped in buyer psychology. The best marketers in the world know that there is a psychological process that must occur for prospects to whip out those credit cards and turn into buyers or even hyper-active buyers. One such person whose perfected this process is Russell Brunson, an "underground entrepreneur" who founded a company called ClickFunnels, a sales funnel SaaS business that empowers marketers from around the world to build marketing automation without all the hassle. 
Principle of commitment & consistency -- When people commit to something, they're far more likely to purchase from you. That's why getting them to agree to something like a free + shipping offer or by agreeing with something you've said in some way. This is a powerful principle in sales and if you pay attention to some of the best marketers in the world, you'll notice that they work fervently to get your commitment to something, even if it's very small in the beginning. 
In marketing automation, Ryan Deiss, co-founder of Digital Marketer, often describes the sales funnel as a multi-step, multi-modality process that moves prospective browsers into buyers. It's multi-stepped because lots must occur between the time that a prospect is aware enough to enter your funnel, to the time when they take action and successfully complete a purchase. 
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