An example of where it isn't the most relevant channel of marketing would certainly include companies that have a very clearly defined list of target clients. For example, if you only deal with governments/councils or hospitals in the UK. The 2nd is positions, where a website comes up in a search. Third-party firms such as Moz.com supply ranking information and can demonstrate exactly how those rankings change over time. However it's likewise necessary to have people to supply that service or product to a customer.