The seller, whether a solo entrepreneur or large enterprise, is a vendor, merchant, product creator, or retailer with a product to market. The product can be a physical object, like household goods, or a service, like makeup tutorials. Also known as the brand, the seller does not need to be actively involved in the marketing, but they may also be the advertiser and profit from the revenue sharing associated with affiliate marketing.
You can use social media to share your blog content with affiliate links, or you can directly share your affiliate links. Note, that you should give an indication that the link is an affiliate link when you post to be transparent and not annoy your followers. People don't want to be sold to all the time, so posting affiliate links should be interspersed with non-affiliate and non-sales posts.