Marketing
Marketing is about choosing the tools & methods to sell. Advertising is about how you use a particular tool & method... strategy vs. tactics.
Customer Engagement
Your own website is THE place where you can perform "Customer Engagement" at its best. Using other websites like FaceBook, Twitter and the social media is a back-door method that deprives you of all the power of your own multiple media, your own webpapge analytics, your own personal engagement, your own blog and your own control over how you do engage your potential and existing customers.