I wonder what influencer marketing is.
It's a type of marketing that's focused on individuals. You see it in social media. 
Who well know infuencer should I know?
The Kardashians might be an example. Their tastes influence certain potential buyers.
What products do they promote?
Different diet, fashion, and cosmetics. Influencers sometimes basically give testimonials to how much they like a product, and that makes others want to buy it. 
Ok but they disclose that they are paid to do that or are they sneaky about it.?
Usually more sneaky about it. Other "value-added" influencers might be journalists or industry analysts.  If they say a product is good, people believe them.
Hmm yes I guess is someone I likes recommend a product I will sure check it but I would like to know if they are been paid or not.
the concepts of promoters and detractors.
The idea revolving around the "two-step flow of communication" was introduced in "The People's Choice" (Paul Lazarsfeld, Bernard Berelson, and Hazel Gaudet, a 1940 study on the decision making process of voters). This idea was further developed in "Personal Influence" (Lazarsfeld, Elihu Katz 1955) as well as "The Effects of Mass Communication" (Joseph Klapper 1960).
Influencers.
There is a lack of consensus on what an "
at it is a domain that holds different stores. For example, Urban Outfitters, American Eagle, Uggare companies like these listed can be found within the dote shopping app.
Advertising through apps Brand Influencers.
Since 2010, the increase of brand influencers is a new type of marketing. A brand influencer, it's an individual who uses their social media platform as a leverage to promote brands with sponsored content. Many types of brand influencers are models, bloggers, and athletes. However, it is important to note that