While I agree, I'd say that SEO isn't everything. If I, as someone who hires frequently, see someone with many LinkedIn certificates, I discount them. I look for high-value course providers such as Stanford or Harvard. If someone is taking low-value brand courses (the more, the worse) I think that they're either not very ambitious or not very smart with their use of time. Call it bias, but having gone through a lot of education myself, I can judge the quality and meaning of a certificate.