This question has a tendency to get thrown around in various ways. On one hand we have the articles that profess “not” to show ROI since it’s hard to put a value on the strength of 1 visitor (potential client, visitor, competitor or other) and YOUR VALUE that of creating a healthy site. Other articles get into the complications of if” Social media counts and if your SEO efforts have impact on Referrals should they also be included?”…and so on……….