How do businesses track online activties? Purposes, methods, different entities are explained well in this FTC article . What are Flash cookies? What is device fingerprinting? How does tracking in mobile apps work? Who places cookies on the web? along with first-party, third party cookies are detailed in the article. While third party cookies are going away, but here's an excellent article on third paty cookies , past, present, and future. Speaking of first party and third party data, here is a good example provided on Stirista blog . In their mini-case study, here's how they used Twitter users' data to enhance reach and conversions for L'Oreal: L’Oreal is a well-known global brand that, through its namesake brand, as well as its subsidiaries (which include Lancôme, Maybelline and Garnier among others), manufactures and distributes skin care, fragrances, hair care and cosmetic products.Targeting your competitors’ followers, a.k.a. Competitive conquesting, simply makes ...