Blockchain described here in a previous post is a data base or ledger that allows information to be stored and distributed, but not to be changed or copied. It is decentralized and is the sole system of record for any given transaction or set of agreed transactions.
Blockchain marketing, though yet in its infancy, has the potential to disrupt the search engine and online advertising industry (PPC, SEM, Banner Ads, etc..) because it will remove the need for third party platforms such as Google or Facebook. Currently businesses use these platforms to place ads and target potential customers. These platforms gain a great amount of personal data from the customer (person who performs the search) plus a huge revenue stream from the businesses that advertise. However, this may all be about to change. Blockchain marketing companies are focusing their efforts on search-data privacy, giving users full control over their data.