20 years ago, just before the internet took off, we used to call it the "brochure solution" because all our clients thought they needed a brochure to sell their product, program, or business service.
They often got a brochure, or a postcard, or a flyer, or a direct mail piece, but they also got guidance on how to design them, how to write them, what to do with them, when & how to distribute them, and how to support their investment with other marketing tools like news releases, events, advertising, speeches etc. We could add a lot of value to that little brochure request.
Today, the website is the new brochure.
While everyone needs one, and they're worth investing in, they need a lot of support. New products, programs, and business services need more support than "putting it out there on social media." Social media can help drive traffic to your website but there's so much more than that to do. Social media (Twitter, Facebook, Pinterest Google+ etc), isn't a marketing plan.
When we develop marketing plans we consider strategies in public relations (including social media, text messaging, events, email etc), government relations, media relations, stakeholder relations, customer relations, staff relations, advertising (online, mobile, traditional etc), product and content development. When designed into an integrated marketing plan, these strategies can all help achieve your goals as well as drive traffic to your website.
So don't make the mistake of making a website and social media your only marketing solution.
If it's worth doing, it's worth doing well.