With ads, you can reach out to users who want your products, but don't know about you yet.
Improving your sites SEO makes it easier for your site to be found by people on Google & Bing.
Social media is a great way of staying connected with your users. They'll hear what you're doing, and visa versa.
In the Know
You can know what pages are getting hit the most, how many visitors are coming to your site, and much more.