The General Data Protection Regulation (GDPR), which took effect on May 25, 2018, is a set of regulations governing the use of personal data across the EU. This is forcing some affiliates to obtain user data through opt-in consent (updated privacy policies and cookie notices), even if they are not located in the European Union. This new regulation should also remind you to follow FTC guidelines and clearly disclose that you receive affiliate commissions from your recommendations. 
I will give you a very simple example. Let’s say you build up an audience of 50,000 readers and out of that 50k you have about 1% that trust you (1% of people that trust you online is actually very huge), so that equates to 500 readers. Out of that 500 readers you will have about 10% that will buy your eBook and other affiliate products, so 50 people total. So, if you are selling your eBook for $10, you will make $500. Of course it doesn’t stop there, those people that buy the eBook and like it will most likely recommend it, and you will have a snowball effect where more people keep buying your book and other affiliate products. This is just a rough example that shows you some realistic numbers. Do not ever think that if you build up a huge number of readers that they will all trust you and buy the products that you promote; if it was that easy everyone would be a millionaire by now.
I started a blog which I plan to monetize only through affiliate marketing and my own products, no ads. I’ve been working on building an audience for my blog, for about 1 year and a half, many people think is maybe too much time, but I just want to make sure that I build enough trust with my readers before I start to try to make them buy something.
Many consumers have reservations about online behavioral targeting. By tracking users' online activities, advertisers are able to understand consumers quite well. Advertisers often use technology, such as web bugs and respawning cookies, to maximizing their abilities to track consumers.[60]:60[95] According to a 2011 survey conducted by Harris Interactive, over half of Internet users had a negative impression of online behavioral advertising, and forty percent feared that their personally-identifiable information had been shared with advertisers without their consent.[96][97] Consumers can be especially troubled by advertisers targeting them based on sensitive information, such as financial or health status.[95] Furthermore, some advertisers attach the MAC address of users' devices to their 'demographic profiles' so they can be retargeted (regardless of the accuracy of the profile) even if the user clears their cookies and browsing history.[citation needed]

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Very nice article! Affiliate marketing is perfect for bloggers as long as they offer quality content and are upfront about it. If people are willing to donate money to YouTubers via Patreon, why wouldn’t they buy something that they want or need through the site or blog of someone that offers them great content and support his or her efforts? It’s a win – win kind of deal.
5) Favorites tools/equipment blog posts: Your audience wants to know how YOU do something. Let them know by writing a blog post that tells them exactly what you use in your business. For example, one post I have planned is “My Favorite Tools for Livestreaming on Facebook.” I will have links to my lighting equipment, microphone, and camera on Amazon via affiliate links.
Affiliate marketing is commonly confused with referral marketing, as both forms of marketing use third parties to drive sales to the retailer. The two forms of marketing are differentiated, however, in how they drive sales, where affiliate marketing relies purely on financial motivations, while referral marketing relies more on trust and personal relationships.[citation needed]
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