Traffic for a website is like blood flowing through the veins: without it, the body dies. The challenge is that the blood will be recycled, but social media is on a one-way trip if everything works. The only reason the website exists is to receive traffic, but social media can be considered a tool for delivering a message, and if that is all it does, it is indeed a one-way trip.
The better use of social media would be to engage with an audience, inviting responses and comments. On the other hand, the website would die if nothing came to it, and an audience could be invited.