Social Media, since it came into trend, has always remained on top of all publicity and marketing. The platforms might change, but the agenda remains the same. It is no longer a platform where you could only share your pictures and make friends. ow, you can add campaigns, run adds, monetize your page and what not.
So, even if you have an outstanding website, but no social media influence, you might lag behind. The most used social media platform for marketing is Facebook. However, Instagram is not far behind. More of all, Instagram looks a bit more attractive, if you ask me.