According to Statistica, 76% of the U.S. population has at least one social networking profile and by 2020 the number of worldwide users of social media is expected to reach 2.95 billion (650 million of these from China alone). Of the social media platforms, Facebook is by far the most dominant - as of the end of the second quarter of 2018 Facebook had approximately 2.23 billion active users worldwide (Statistica). Mobile devices have become the dominant platform for Facebook usage - 68% of time spent on Facebook originates from mobile devices.
SellHealth — SellHealth is a health affiliate network. It’s free for affiliates to join, should their applications be accepted. All of SellHealth’s sales are made through company-owned websites, meaning affiliates don’t need to facilitate sales on their own sites. This eliminates the possibility of error and increases consumer trust, as they are sent to a legitimate brand site to complete their purchases.
Some advertisers offer multi-tier programs that distribute commission into a hierarchical referral network of sign-ups and sub-partners. In practical terms, publisher "A" signs up to the program with an advertiser and gets rewarded for the agreed activity conducted by a referred visitor. If publisher "A" attracts publishers "B" and "C" to sign up for the same program using his sign-up code, all future activities performed by publishers "B" and "C" will result in additional commission (at a lower rate) for publisher "A".
How established is your site/blog/social media following? Do you already have an audience of 1 million or are you just getting started? Early on in your affiliate marketing journey you will probably want to have multiple options to make sure you can cover a broad field. You might want to become an Amazon Associate as well as joining one of the networks so you will have a product link to drop into any posts you do. An easy place to start is to promote the services you are using if you are enjoying their product - web hosting or email management systems like Aweber.