It has often been mooted that SEO on its own is enough to conduct digital marketing for companies. Studies however have proven otherwise. Leads get generated but conversion depends a lot on the convergence effect of a multi-pronged approach. That is where the website must be aligned in such a way as to handle customers. This could be through a blog or news page. Social media platforms especially Facebook, YouTube and Twitter are perfect to capture wide audience and engage millennials as they are already hooked to the same. Email marketing while a relatively older form continues to be extremely reliable a source of lead conversion. Social networks and Google AdWords also provide advertising space which can prove to be essential touch points to engage with the customer base. Source:  https://www.linkedin.com/pulse/can-seo-alone-successful-lead-gen-online-marketing-effort-thimothy